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【题目】 carefully if any change occurs when doing experiments in the lab..
A.Observe
B.To observe
C.Observed
D.Observing

【答案】A
【解析】句意:在实验室做实验的时候,认真观察是否发生变化。根据上下文可知,后面提供了两个从句,一个宾语从句、另一个为时间状语从句的省略句,由此可知,在某条件下和某时间,建议某人做某事。因此,应该选择动词原形,引起的是祈使句。所以,本题选A。

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