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
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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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