______carefully if any change occurs when doing experiments in the lab.

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问题 ______carefully if any change occurs when doing experiments in the lab.

选项 A、Observe
B、To observe
C、Observed
D、Observing

答案A

解析句意：在实验室做实验时，你要仔细观察是否有任何变化发生。本题考查祈使句，题干是老师对学生做实验的要求。动词原形observe前面省略了主语you和情态动词should，when的后面省略了you are。因为有when这个连词，所以when前是一个句子，B、C、D三项都不能构成句子，只有A项符合题意。故答案选A。

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本试题收录于：中学英语题库教师公开招聘分类

中学英语

教师公开招聘

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______carefully if any change occurs when doing experiments in the lab.

中学英语

教师公开招聘

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