I need one more stamp before my collection __.A.have been completed B.is completed

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I need one more stamp before my collection __.A.have been completed B.is completed

I need one more stamp before my collection __.A.have been completed B.is completed
I need one more stamp before my collection __.
A.have been completed B.is completed

I need one more stamp before my collection __.A.have been completed B.is completed
B
A同B都系被动结构
将从句变为主动结构就自然可以得出正确答案

B
条件状语从句,显然用一般现在时

B
COMPLETED不需要加HAVE BEEN,也加不了HAVE BEEN,因为它是瞬间动词

A

我认为应该选B
因为:
这个句子用了被动语态,其实真正应该是"before my collection is completed by myself! "
这一动作的发出者是I,而my collection只系被动既!``

B