单项选择题
Hardly ______ the classroom when the class began.
A．had he entered
B．he had entered
C．he entered
D．he was entered
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单项选择题
He couldn't use his own car because it ______ then.
A．was being repaired
B．was repairing
C．is repairing
D．has been repaired
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单项选择题
I have not decided which seat
A．to sit
B．is to sit
C．to sit on
D．is for sitting
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