It is wise for the observer not to take part in the activity observed at all time._精华吧

It is wise for the observer not to take part in the activity observed at all time.

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It is wise for the observer not to take part in the activity observed at all time.

A.正确

B.错误

正确答案：B

Tag：英语学术论文写作时间：2021-11-28 15:26:16

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