The correct option to complete the sentence "He went up quickly and returned ...." is
D. as fast.
Explanation of the Correct Answer
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Understanding the Sentence Structure: The sentence is structured to compare the manner in which he returned to the manner in which he went up. The word "quickly" is an adverb that describes how he went up. To maintain parallel structure, we need an adverb that describes how he returned.
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Choosing the Right Form: The phrase "as fast" is a comparative adverbial phrase. It is used to compare the speed of his return to the speed of his ascent. The structure "as + adjective/adverb + as" is commonly used in English to indicate that two actions are being compared in terms of their quality or manner.
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Why "as fast" is Correct:
- "Fast" is an adverb in this context, meaning "quickly." The phrase "as fast" indicates that he returned at the same speed as he went up.
- The use of "as" here is essential because it sets up a comparison, which is what the sentence requires.
Why the Other Options are Incorrect
- A. fastest:
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"Fastest" is the superlative form of "fast." It implies that he returned at a speed that is faster than anyone else or anything else, which does not fit the context of the sentence. The sentence does not suggest a comparison with others, but rather a comparison of his own actions.
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B. fastly:
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"Fastly" is not a standard English word. The correct adverb form of "fast" is simply "fast." Therefore, this option is grammatically incorrect and should not be used.
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C. as fastly:
- Similar to option B, "fastly" is not a recognized adverb in standard English. The correct form is "fast," making "as fastly" incorrect. The phrase should be "as fast" to maintain proper grammatical structure.
Summary of Key Points
- The correct answer is D. as fast because it maintains the comparative structure needed in the sentence.
- "Fast" is the appropriate adverb to describe the speed of the return, while "as" sets up the necessary comparison.
- Options A, B, and C are incorrect due to misuse of comparative forms or non-standard English usage.
- Always ensure that the adverb used matches the structure and intent of the sentence for clarity and correctness.
Revision Summary
- Use "as + adverb/adjective + as" for comparisons.
- "Fast" is the correct adverb; "fastly" is not standard English.
- Superlative forms (like "fastest") are not suitable for comparisons between two actions.
- Ensure grammatical consistency in sentence structure for clarity.