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I know him ---a good football player while in college.A to h

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I know him ---a good football player while in college.A to have been B to be C was D had been 说理
I know him ---a good football player while in college.A to h
A,know sb to have been 表示知道某人曾经是.这里的sb是宾格.
to have been 表过去.因为这个句子要表达的是他在学校的时候是个很好的足球运动员.所以要表达的是过去的状态,要表达过去就要用to have done 的形式.所以B项错误.
C和D项错误在于,him后不可能加谓语,除非把him改成he,则可以考虑C和D.