You ______ be tired--you've only been working for an hour.
A.must notB.won'tC.can'tD.may not在线课程C
解析:
根据题意,这里表示“不可能”。may, must表推测时,常常用于肯定句,不用于否定句、疑问句。如果需要,否定句、疑问句中常用can。另外,may not表示“可能不”的意思。
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