Many a student (grasp) ______ the usage of the word since the teacher explained

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问题 Many a student (grasp) ______ the usage of the word since the teacher explained it.

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答案 has grasped

解析 many a表示“不止一个，许多”，但是其后的谓语动词必须用单数。而"since"表示“自从……”引导的时间状语，通常从句用一般过去时，主句要用现在完成时。

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Manyastudent(grasp)______theusageofthewordsincetheteacherexplained