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        1. I _____ go to bed ______ my mother returned home.

          A.don’t ,until B.don’t, when
          C.didn’t ,until D.didn’t, when

          C

          解析試題分析:句意:我直到我母親回家,我才上床睡覺。not ......until......直到……才……;根據(jù)動(dòng)詞returned可知此處用一般過去時(shí),故用助動(dòng)詞didn’t。故選C。
          考點(diǎn):考查時(shí)態(tài)的用法。

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