题目内容
20、
―Is Jack on duty today?
―It be him. It’s his turn tomorrow.
A. mustn’t B. won’t C. can’t D. needn’t
试题答案
20、
C．
解析：
本题考查在具体的语境中情态动词表推测的用法。根据句意，回答应该是“不可能是他”。在情态动词表推测时，must不能用于否定句。D 意思不对。
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