1. [2014 •北京卷]     carefully if any change

occurs when doing experiments in the lab.

A. Observe       B. To observe

C. Observed      D. Observing

1.    A考査非謂語動詞。根據(jù)上下文可知，后面提供了兩個從句，一個為條件狀語從句，另一個為時間狀語從句的省略句。由此可知，句意表述在某條件下和某時間，建議某人做某事。這里選擇動詞原形，引導的是祈使句。故選A。

題目來源：2015全品語法快練高中英語新課標 > 訓練17 非謂語動詞和獨立主格

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