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—When shall we set about doing our work?...

—When shall we set about doing our work?

—______ all the group members are here.

A.Until B.Since

C.Unless D.Not until

 

D 【解析】 考查连接词辨析。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。本句是省略句,完整的句子是We shall not set about doing our work until all the group members are here.由此可知,应使用not until。故选D。  
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