问题 选择题

None of them knew what happened __________we told them about it.

A.since

B.after

C.until

D.while

答案

答案:C

考查连词用法。since自从,after在…之后,until直到,while当…时候,句意:他们当中没有一个人知道出什么事了直到我告诉他们。根据语境应选C。

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