carefully if any change occurs when doing experiments in the lab.._刷题宝

题干

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

A：Observe

B：To observe

C：Observed

D：Observing

上一题下一题 0.0难度选择题更新时间:2017-04-28 02:16:40

答案(点此获取答案解析）

A

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