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
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单项选择题
Nowhere else in the world______ more beautiful fight than in Switzerland.
A．you can fmd
B．is found
C．can you find
D．has been found
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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