Someone is knocking at the door. It my sister. Its time for her to be back.A. can’t beB.

发布时间：2020-08-23 08:03:54

Someone is knocking at the door. It      my sister. It's time for her to be back.
A. can’t be
B. may not be
C. must be
D. mustn’t be

网友回答

A. can’t be
B. may not be
(答案→)C. must be
D. mustn’t be
解析：句意：有人在敲门。肯定是我的姐姐，这个时间她应该回来了。must be表示强烈的肯定推测，意为“一定是”，故选C
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