How he _______ get out of the prison ______ a mystery.
A.could; isB.can; isC.was able to; remainsD.able to; remain
C
考查情態(tài)動詞。句中be able to其過去式表示成功的做某事,從句作主語,謂語動詞用單數(shù)形式,故選C。句意:他怎么成功的出監(jiān)獄還是個迷。
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