【題目】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:比爾在演示如何做之前,他是不會(huì)開始實(shí)驗(yàn)的。考查一般現(xiàn)在時(shí)的被動(dòng)語態(tài)。A. will show一般將來時(shí);B. shows一般現(xiàn)在時(shí);C. will be showed一般將來時(shí)的被動(dòng)語態(tài);D. is showed一般現(xiàn)在時(shí)的被動(dòng)語態(tài)。Not…until…:直到,在以前不做;主句用將來時(shí),從句用一般現(xiàn)在時(shí);結(jié)合句意和語境可知選D。

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