They/ not answer/phone/ this morning, so/ must/ out/. They hasn't answered

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is best made up from the prompts.

A. They hasn't answered the phone this morning so they must have been out. 

B. They didn't answer the phone this morning so they must be out. 

C. They didn't answer the phone this morning so they must have gone out. 

D. They hasn't answered the phone this morning so they must go out.

* Đáp án

C

* Hướng dẫn giải

Chọn C

    A. They hasn't answered the phone this morning so they must have been out. (sai thì giữa 2 vế)

    B. They didn't answer the phone this morning so they must be out. ( sai vì không đồng nhất thì giữa 2 vế)

    C. They didn't answer the phone this morning so they must have gone out.

    D. They hasn't answered the phone this morning so they must go out. (sai thì giữa 2 vế)

ð Đáp án C

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