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

A. Observe B. To observe

C. Observed D. Observing

 

A

【解析】

試題分析：考查非謂語(yǔ)動(dòng)詞。句意：在實(shí)驗(yàn)室做實(shí)驗(yàn)時(shí)，（你）要仔細(xì)觀察發(fā)生的變化。本句是一個(gè)祈使句，祈使句________carefully后跟了一個(gè)if條件句和when引導(dǎo)的時(shí)間狀語(yǔ)從句，故選A。

考點(diǎn)：考查非謂語(yǔ)動(dòng)詞

 

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