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    __ carefully if any change occurs when doing experiments in the lab..

    A. ObserveB. To observe

    C. Observed D. Observing

     

    A

    【解析】

    试题分析：本题考查非谓语动词。考查方式为识别是否适用非谓语动词。根据上下文可知，后面提供了两个从句，一个为条件状语从句、另一个为时间状语从句的省略句，由此可知，在某条件下和某时间，建议某人做某事。因此，应该选择动词原形，引起的是祈使句。所以，本题选A。

    考点：本题考查非谓语动词。

     

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