题目内容
15. carefully if any change occurs when doing experiments in the lab.( )A. | Observe | B. | To observe | C. | Observed | D. | Observing |
分析 句意:当在实验室做实验时,要仔细观察是否有变化发生.
解答 答案:A
由句意可知,此题是祈使句.因为"祈使句,无主语,动词原形作谓语".故选A项.
点评 考查祈使句.主要本着"祈使句,无主语,动词原形作谓语"的原则做此类题目.
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