【題目】Don't arrive late for class. We ________ on time.

A. can be B. must be

C. may be D. will be

【答案】B

【解析】句意:上課不要遲到,我們必須按時。can be能是;must必須是;may be可以是,可能是;will be將會是。根據(jù)句意可知,我們必須按時上課,故應用must,后面跟動詞原形be。選B。

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