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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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

单项选择题

I won't go there _________ invited.

A．unless
B．without
C．whether
D．be not to

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