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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

          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(shí)間副詞now來(lái)修飾,此處用現(xiàn)在進(jìn)行時(shí),故選D。
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