【題目】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:這些學(xué)生要等到老師向他們展示如何操作,他們才能開始做實(shí)驗(yàn)。

考查動詞辨析。will show 一般將來時;show一般現(xiàn)在時(動詞原形);showed一般過去時;shows一般現(xiàn)在時(三單形式)。句中not…until表示直到……才,引導(dǎo)時間狀語從句,主句用的是一般將來時,從句要用一般現(xiàn)在時,主語the teacher是單數(shù),所以謂語動詞要用三單形式。故選D

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