When I passed their house, all the lights had been turned off. They_____________ to bed already.

Câu hỏi :

When I passed their house, all the lights had been turned off. They_____________ to bed already.

A must go    

B should have gone

C must have gone   

D need have gone

* Đáp án

C

* Hướng dẫn giải

Phương pháp giải:

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