【題目】 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:在實(shí)驗(yàn)室做實(shí)驗(yàn)的時(shí)候,認(rèn)真觀察是否發(fā)生變化。根據(jù)上下文可知,后面提供了兩個(gè)從句,一個(gè)賓語(yǔ)從句、另一個(gè)為時(shí)間狀語(yǔ)從句的省略句,由此可知,在某條件下和某時(shí)間,建議某人做某事。因此,應(yīng)該選擇動(dòng)詞原形,引起的是祈使句。所以,本題選A。

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