Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions:
They/ not answer/phone/ this morning, so/ must/ out/.
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Lời giải:
Báo saiA 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)
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