—The teacher asked all the students in the class to keep their eyes ______ fo...

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问题 —The teacher asked all the students in the class to keep their eyes ______ for 5 seconds.
选项 A. close B. to close C. closing D. closed
答案 D
解析 老师要求班上所有的学生保持他们的眼睛闭上5秒。

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