选什么,然后请陈述理由I need one more stamp before my collection ___________.A.has completed B.completeC.has been completed D.is completed

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选什么,然后请陈述理由I need one more stamp before my collection ___________.A.has completed B.completeC.has been completed D.is completed

选什么,然后请陈述理由I need one more stamp before my collection ___________.A.has completed B.completeC.has been completed D.is completed
选什么,然后请陈述理由
I need one more stamp before my collection ___________.
A.has completed B.complete
C.has been completed D.is completed

选什么,然后请陈述理由I need one more stamp before my collection ___________.A.has completed B.completeC.has been completed D.is completed
应该选c,收集邮票这件事应该是被完成所以用被动语态排除A,B,根据题意,时态应该为现在完成时,所以选c

选D
解析:complete是及物动词,“邮集”是被人完成的,须从表被动意的C、D中选择。又因before等引导的时间状语从句中谓语要用一般现在时代替一般将来时,所以此题答案为D。

选C.has been completed
语态是被动;时态是现在完成时。

选D,is completed 表被动,由题意可知是被收集完成;主句是一般时,从句也只要用一般时就行了

C
在集邮结束前还需要一张邮票
首先要用被动语态,排除AB
然后用完成时

D 被完成 属于被动

选D。首先明显用被动语态,我觉得语法难记忆,但我总结了一下凡是出现before,if 引导的条件状语从句后都要用一般现在时。