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 is a bad smell hem.-- Oh, dear ! I______ the gas.
A．must forget turning off
B．must forget to turn off
C．must have forgotten turning off
D．must have forgotten to turn off
单项选择题
Goodbye, Mr. Smith. I'm very pleased______.
A．to meet you
B．to have met you
C．meeting
D．having met you
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