He ____ known about the faulty wiring. He would have noticed it.   Group of answer choicescouldn’t havemight havemust have

To determine the correct phrase to fill in the blank, we need to consider the implication of the sentence.

1. Understanding the Context: The sentence suggests that someone had the opportunity to notice something (the faulty wiring), and given that it is stated as a fact that he did not mention it, we can infer about his knowledge of the situation.

2. Analyzing the Choices:

   • couldn’t have: This implies impossibility, indicating that it was not possible for him to know about the faulty wiring. This does not fit well because the context suggests he could have noticed it.
   • might have: This implies a possibility, suggesting he perhaps could have known about the faulty wiring but does not assert certainty. This is a weaker assertion than what the context demands.
   • must have: This indicates a strong conclusion; it is used when we are fairly certain about something based on the available information. In this context, it suggests that he definitely had the chance to know about the wiring since he would have noticed it.

3. Conclusion: The best choice that fits the context of the sentence is "must have."

Final Answer

He must have known about the faulty wiring.