Many a student______that mistake before.

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问题 Many a student______that mistake before.

选项 A、had made
B、has been made
C、have mad
D、has made

答案D

解析 句意:许多学生以前就犯过这种错误。“many a”虽然表达复数概念意为“许多”但当它作主语时谓语动词用单数。
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