He had to be reminded two or three times ________ he could avoid making the same mistake.
A．before B．until C．when D．a(chǎn)fter
A
連詞辨析。A.在……之前 B. 直到…… C. 當……時 D. 在……之后。句意：在他可以避免犯同樣的錯誤之前，不得不提醒他三到兩次。選A。
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