Jane is resting when someone ______ the door.

A. knocks at
B. is knocking
C. knock at
D. knocks
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科目:初中英語 來源:福建省期中題 題型:單選題

Jane is resting when someone ______ the door.
[     ]
A. knocks at
B. is knocking
C. knock at
D. knocks

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