问题描述：
The two boys look alike very much. They ___ be twins.
A. mustn't B. can't C. must D. have to
我选的是C, 但答案是B,答案是不是错了?
A. mustn't B. can't C. must D. have to
我选的是C, 但答案是B,答案是不是错了?
问题解答：
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