题目内容
(C ) 9. ( 2014 河北)Someone _ at the door.
Can you answer it?
A. knocks B. knocked
C. is knocking D. was knocking
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题目内容
(C ) 9. ( 2014 河北)Someone _ at the door.
Can you answer it?
A. knocks B. knocked
C. is knocking D. was knocking