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---Did you wait for him long?
---No, I hadn’t waited long _______ he appeared.
A.unlessB.untilC.beforeD.since
C
连词辨析。A.除非 B. 直到 C. 在……以前  D. 自从……以后。句意:你等了他很长时间吗?——不,在他出现前我没有等很久。故选C。
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