The correct option to complete the sentence "He told me to go on .... till seven" is D. working. Let's break down why this is the correct choice and analyze the other options. Explanation of the Correct Answer (D. working)

1. Understanding the Phrase: The phrase "go on" is often followed by a gerund (the -ing form of a verb) when it indicates continuing an action. In this case, "go on working" means to continue the action of working.
2. Grammatical Structure: The structure "go on + gerund" is a common English construction. It implies that the speaker is being instructed to continue doing something. Here, "working" is the gerund form of the verb "work."
3. Contextual Meaning: The sentence suggests that the person should continue their work until a specified time (seven o'clock). Using "working" fits perfectly in this context, as it conveys the idea of ongoing action.

Why the Other Options Are Incorrect

• A. to work: This option uses the infinitive form of the verb. While "go on to work" could be grammatically correct in a different context (implying a transition to a new action), it does not fit here because the sentence requires a continuation of the current action, not a new one.
• B. worked: This is the past tense form of the verb "work." Using "worked" would imply that the action is completed, which contradicts the instruction to "go on." The sentence would not make sense if it suggested that the action of working has already finished.
• C. works: This is the present simple form of the verb "work." It does not fit the context of the sentence, as it does not convey the idea of continuing an action. "Works" could imply a habitual action or a general truth, but it does not indicate ongoing activity in the same way that "working" does.

Summary of Key Points

• The correct answer is D. working because it follows the structure "go on + gerund," indicating the continuation of an action.
• The other options (A, B, C) do not fit the context of the sentence as they either suggest a new action, a completed action, or a general statement rather than ongoing activity.
• Understanding verb forms and their appropriate contexts is crucial for selecting the correct option in sentences.

Revision Summary

• Correct Option: D. working (gerund form indicating continuation).
• Incorrect Options: A. to work (infinitive, suggests a new action), B. worked (past tense, suggests completion), C. works (present simple, does not indicate ongoing action).
• Key Structure: "go on + gerund" is a common English construction for indicating continuation.
• Context Matters: Always consider the meaning and context of the sentence when choosing the correct verb form.