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(yǔ)動(dòng)詞。根據(jù)上下文可知，后面提供了兩個(gè)從句，一個(gè)為條件狀語(yǔ)從句，另一個(gè)為時(shí)間狀語(yǔ)從句的省略句。由此可知，句意表述在某條件下和某時(shí)間，建議某人做某事。這里選擇動(dòng)詞原形，引導(dǎo)的是祈使句。故選A。

題目來(lái)源：2015全品語(yǔ)法快練高中英語(yǔ)新課標(biāo) > 訓(xùn)練17 非謂語(yǔ)動(dòng)詞和獨(dú)立主格

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