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【题目】The lab can be dangerous, so we________ always wait for the teacher to arrive before we start work.

A.mayB.can’tC.mustD.needn’t

【答案】C

【解析】

句意:实验室可能很危险,所以我们必须在开始工作前等老师来。

考查情态动词。may可能;can’t不能;must必须;needn’t不需要。根据“The lab can be dangerous,”实验室可能很危险。可知,应该是在开始工作前必须等老师来。故选C

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