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________carefully if any change occurs w...

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

A. Observe   B. To observe

C. Observed   D. Observing

 

A 【解析】 试题分析:考查非谓语动词。句意:在实验室做实验时,(你)要仔细观察发生的变化。本句是一个祈使句,祈使句________carefully后跟了一个if条件句和when引导的时间状语从句,故选A。 考点:考查非谓语动词  
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