We___never___the boys beforeA.has;seen B.have;seen C./;saw D.did;see
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We___never___the boys beforeA.has;seen B.have;seen C./;saw D.did;see
We___never___the boys before
A.has;seen B.have;seen C./;saw D.did;see
We___never___the boys beforeA.has;seen B.have;seen C./;saw D.did;see
We=我们要用have;
have never seen现在完成式
所以选B