Every student is required to watch the teacher carefully before the chemistry experiment.

发布时间：2020-08-16 22:28:04

Every student is required to watch the teacher carefully before      the chemistry experiment.
A. performing
B. taking
C. picking
D. having

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(答案→)A. performing
B. taking
C. picking
D. having
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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