Question

【题目】—When shall we set about doing our work?

—______ all the group members are here.

A. Until B. Since

C. Unless D. Not until

Answer 1

【答案】D

【解析】

考查连词辨析。句意：——我们什么时候开始工作?——直到所有的组员都来了。A. Until在…以前；B. Since自…以来；C. Unless除非；D. Not until直到…才，根据题意，故选D。