Question

【题目】Several weeks had gone by ________ I realized the painting was missing.

A.asB.sinceC.whenD.before

Answer 1

【答案】D

【解析】

考查连词。句意：几个星期过去了，我才意识到那幅画不见了。A. as随着……；B. since自从……；C. when当……时候；D. before在……之前。此处表示在意识到之前已经过去了几个星期，要用before。故选D。