【題目】They had not known each other three days ______ they began to quarrel.
A.after
B.until
C.when
D.before

【答案】D
【解析】句意：他們認(rèn)識還不到3天就開始吵架了。A. after在……之后；B. until直到；C. when當(dāng)……的時候；D. before在……之前。故選D。

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