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        1. While she _____ TV, someone _______ at the door.
          A.watch, knockedB.was watching, knocked
          C.watching, knockingD.was watching, is knocking
          B

          試題分析: 句意:當她在看電視時,有人敲門。knock at 敲門;while當……的時候,引導(dǎo)的時間狀語從句動詞為延續(xù)性動詞,進行時態(tài),與主句同時發(fā)生,故選B
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