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        1. —What’s your mother__________ now?
          —She’s __________ our house.

          A.doing, clean B.do; clean
          C.does; cleans D.doing; cleaning

          D

          解析試題分析:句意:——現(xiàn)在你的母親正在干什么?——她正在打掃我們的房間。有時間副詞now來修飾,此處用現(xiàn)在進(jìn)行時,故選D。
          考點:考查時態(tài)的用法。

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