中文谷—Look！Ourmathteacherisstandingoutsideourclassroom.—It
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问题详情：
—Look！Our math teacher is standing outside our classroom.
—It ________ be has gone to his office.
A．mustn't B．might C．may not D．can't
【回答】
D
知识点：情态动词
题型：选择题
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