单项选择题

My sister is used to ______with all the windows open.

A．sleep
B．sleeping
C．have slept
D．the, sleeping
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单项选择题
I will leave him a note ______he'll know where we are.
A．so that
B．that
C．in order
D．for
单项选择题
Usually there is ______traffic in the streets on weekdays than on Sundays.
A．little
B．less
C．few
D．fewer
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