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【题目】The student’s won’t start the experiment until the teacher them how to do it.

A.will showB.showC.showedD.shows

【答案】D

【解析】

句意:这些学生要等到老师向他们展示如何操作,他们才能开始做实验。

考查动词辨析。will show 一般将来时;show一般现在时(动词原形);showed一般过去时;shows一般现在时(三单形式)。句中not…until表示直到……才,引导时间状语从句,主句用的是一般将来时,从句要用一般现在时,主语the teacher是单数,所以谓语动词要用三单形式。故选D

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