单项选择题

There was a second knock at the door. It was the second time I_____ that afternoon.

A．was interrupted
B．was interrupting
C．had 'interrupted
D．had been interrupted
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单项选择题
______his address, I can' t send this book to him.
A．Not knowing
B．Knowing
C．Not know
D．Not known
单项选择题
--______may I______ the book -- For three weeks.
A．How often; borrow
B．How often; keep
C．How long; borrow
D．How long; keep
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