While Jim ______the floor, someone ______at the door. A．was sweeping, was knocking B．was sweeping, k...
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题目内容：
While Jim ______the floor, someone ______at
the door.
|
A．was sweeping, was knocking
|
B．was sweeping, knocked
|
|
C．swept ,was knocking
|
D．swept, knocked
|
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