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How he _______ get out of the prison ______ a mystery.
A.could; isB.can; isC.was able to; remainsD.able to; remain
C
考查情态动词。句中be able to其过去式表示成功的做某事,从句作主语,谓语动词用单数形式,故选C。句意:他怎么成功的出监狱还是个迷。
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