They/ not answer/ phone/ this morning/ so/ must/ out/.
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.
Giải bởi Vietjack
Đáp án C
Ta loại đáp án A và D do dùng sai thì.
Đáp án B cũng bị loại do không có sự hòa hợp về thì giữa 2 vế.
Dịch: Họ đã không nghe điện thoại sáng nay, vì vậy có thể họ đã ra ngoài.
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