题目内容
Every student is required to watch the teacher carefully before ___ the chemistry experiment.
A. performing B. taking C. picking D. having
A
【解析】本题考查动词辨析。句意为:在操作化学实验之前,每个学生 必须认真观察教师的示范动作。perform表演;操作。
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题目内容
Every student is required to watch the teacher carefully before ___ the chemistry experiment.
A. performing B. taking C. picking D. having
A
【解析】本题考查动词辨析。句意为:在操作化学实验之前,每个学生 必须认真观察教师的示范动作。perform表演;操作。
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