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When the man downstairs knocked at the door, I    A.am doing housework B.was doing housework  C.w...

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a; /    the; the    a; a    the; a  
B.C.D.四个选项中选出一个可以填入空白处的最佳选项。 When the man downstairs knocked at the door, I _______. A. am doing housework    was doing housework    were doing housework   am going to do housework  
where; while   which; as   when; after   when; that  
knock on  knocking on  knocks on  to knock on  
while    when    as    before  
while  however  when  as  
am doing housework    was doing housework   were doing housework    am going to do housework  
thE.thE.A./    A. thE.a…/    A.thE.a…the    a…a…a…the  
knock into      knocked around    knocked into     knocked off  
knock into    knock at    knock on    knock off  
when; knocking   when; knock   that; knocking   that; knock  
while    when    as    suddenly  
had I gone;someone knocked at    I had gone;did someone knock at    had I gone;did someone knock at    did I go;someone knocked at  

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