Question

- What's wrong with you, Madam?
- I've lost my valuable painting. But a week had gone by _______ I knew it was missing.

A．while

B．since

C．until

D．before

Answer 1

D

解析試題分析：句意：——太太，你怎么啦？——我丟了我的貴重的油畫。但是一周過去了，我才知道它丟了。A. while 當……時候；     B. since 自從；   C. until 直到；   D. before在……之前；。根據knew，和had gone可知，在知道之前，那幅畫已經丟了，故用連詞before。故選D。
考點：考查連詞的用法。