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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单项选择题
I didn't feel like() so he suggested () a taxi.

A．to walk; taking
B．walking; taking
C．to walk; to take
D．walking; to take
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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