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【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:在實驗室做實驗的時候,認真觀察是否發(fā)生變化。根據上下文可知,后面提供了兩個從句,一個賓語從句、另一個為時間狀語從句的省略句,由此可知,在某條件下和某時間,建議某人做某事。因此,應該選擇動詞原形,引起的是祈使句。所以,本題選A。

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