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【题目】Students _________ be careful when they do chemical experiments in the lab.

A. can B. may C. need D. must

【答案】D

【解析】

句意:学生在实验室做化学实验时必须小心。考查情态动词。A. can能、会;B. may可以;C. need需要;D. must必须。根据后半句when they do chemical experiments in the lab.“当他们在实验室做化学实验时”,可知前半句的句意为“学生们必须小心”,故答案选D。

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