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I know you___ a member of Green Club for half a year.

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I know you___ a member of Green Club for half a year.
A.become
B.have become
C.have been
D.have joined
C
后面有for half a year,所以是现在完成时,因此排除A,而可以说是joined in a club,不能说joined a member,所以D也排除了.不能用become说变成了一员,这是中式英语,B也排除.所以选择C.
这句话的原型可以这样说,He is a member of Green Club.is变形为have been.