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【题目】Bill won’t start the experiment until he ____ how to do it.

A. will show B. shows C. will be showed D. is showed

【答案】D

【解析】句意:比尔在演示如何做之前,他是不会开始实验的。考查一般现在时的被动语态。A. will show一般将来时;B. shows一般现在时;C. will be showed一般将来时的被动语态;D. is showed一般现在时的被动语态。Not…until…:直到,在以前不做;主句用将来时,从句用一般现在时;结合句意和语境可知选D。

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