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He had to be reminded two or three times ________ he could avoid making the same mistake.
A.before B.until C.when D.after
A
连词辨析。A.在……之前 B. 直到…… C. 当……时 D. 在……之后。句意:在他可以避免犯同样的错误之前,不得不提醒他三到两次。选A。
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