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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单项选择题
-- There is a bad smell here. -- 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
--()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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