“You ______ not be too careful in the exam. Do and check your papers carefully and you ____ not take your papers out of the examination room after the exam.” the teacher told us before the exam.A.must; shouldB.can; shallC.must; shallD.can; could
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B解析考查情态动词，第一空考查can not…too，再怎么也不为过，第二空考查shall用于第二人称表示规定，句意：老师在考试前告诉我们：考试中你再小心也不为过，一定要仔细检查试卷，考试后不能把试卷带出考场。选B。