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I need one more stamp before my collection___.A .has complet

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I need one more stamp before my collection___.A .has completed B.completes C.has been completed D.is completed请说明理由
I need one more stamp before my collection__ D.._.A .has completed B.completes C.has been completed D.is completed
理由:首先可以判断这句话是说将来的事情“我需要再一枚邮票在我完成收集”所以要选择将来时
A.C是过去时,B是一般时,只有D是将来时.
这是个被动语句所以更可以确认是D答案