________booksmustbeproducedforthe

发布时间:2020-07-26 09:28:36

________ books must be produced for the children.A.Many thousandsB.Many thousands ofC.Many thousand ofD.Many thousand

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B解析当表示不具体的数目时用hundreds/thousands/millions +of,当有具体的数字或several,那么hundred/thousand/million后面不加s不要of。
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