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

A.canB.mustC.needD.ought to

【答案】B

【解析】

句意:当学生在实验室中做物理实验时一定要小心。

考查情态动词。can能(表示现在的能力);must必须,一定(表示肯定的推测);need需要;ought to应该(表示责任、义务和劝告)。根据句意可知,表示“做物理实验一定要小心”,故选B

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