单项选择题

I ______on the door for ten minutes now without an answer.

A．was knocking
B．am knocking
C．knocking
D．have been knocking
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单项选择题
The people at the party were worried about Janet because no one was aware ______ she had gone.
A．where that
B．of where
C．of the place
D．the place
单项选择题
The driver might have ______ the accident if he had had his headlights on.
A．missed
B．avoided
C．stopped
D．dismissed
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