Question

【题目】They had not known each other three days ______ they began to quarrel.

A. after B. until

C. when D. before

Answer 1

【答案】D

【解析】考查时间状语从句。A. after在……之后；B. until直到；C. when当……的时候；D. before在……之前。句意：他们认识还不到3天就开始吵架了。故选D。