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](/uploads/image/z/10527713-17-3.jpg?t=We___never___the+boys+beforeA.has%3Bseen+B.have%3Bseen+C.%2F%3Bsaw+D.did%3Bsee)
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