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
Goodbye, Mr. Smith. I'm very pleased______.
A．to meet you
B．to have met you
C．meeting
D．having met you
单项选择题
In those days she was always lost in thought, so that she had to be called three or four times ______ she came to her dinner.
A．until
B．after
C．when
D．before
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