The correct option to complete the sentence "He acts .... he were a general manager" is C. as if. Step-by-Step Explanation:

1. Understanding the Sentence Structure:
2. The sentence is expressing a hypothetical situation. The phrase "he acts" indicates that the subject (he) is behaving in a certain way, and the phrase "he were a general manager" suggests that this behavior is not based on reality but rather on a condition that is imagined or contrary to fact.
3. Identifying the Correct Phrase:
4. The phrase "as if" is commonly used in English to introduce a hypothetical or unreal situation. It implies that the action or behavior being described is not true but is being treated as if it were true. In this case, the person is acting in a manner that suggests he believes he is a general manager, even though he is not.
5. Why "as if" is Correct:
6. The phrase "as if" is used to indicate that the action is not based on reality. In this context, "He acts as if he were a general manager" means that he is behaving in a way that mimics the behavior of a general manager, even though he does not hold that position. This aligns perfectly with the meaning of the sentence.

Analysis of Other Options:

• A. as:
• This option is incomplete and does not convey the intended meaning. "He acts as he were a general manager" is grammatically incorrect because "as" does not introduce a hypothetical situation. It would require a different structure to be correct, such as "He acts as a general manager."
• B. if:
• While "if" can introduce conditional statements, it does not fit well in this context. The phrase "He acts if he were a general manager" is grammatically correct but does not convey the same meaning as "as if." "As if" is more idiomatic and commonly used in English to express the idea of pretending or behaving in a certain way.
• D. so as:
• This option is also incorrect. "So as" typically introduces a purpose or intention, such as "He works hard so as to succeed." It does not fit the context of the sentence, which is about behavior that mimics a role rather than an intention or purpose.

Summary of Key Points:

• The correct phrase to use in the sentence is C. as if, which indicates a hypothetical situation.
• "As if" is used to express actions that are not based on reality but are treated as such.
• The other options do not convey the intended meaning or are grammatically incorrect in this context.
• Understanding the nuances of phrases like "as if" is crucial for mastering English sentence structure and meaning.

Revision Summary:

• The correct answer is C. as if.
• "As if" indicates a hypothetical situation or behavior.
• Other options do not fit the context or are grammatically incorrect.
• Familiarity with idiomatic expressions enhances understanding of English.