单项选择题

It is not difficult for a person to ________ a bad habit.

A．pick up
B．make up
C．turn up
D．keep up
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单项选择题
It is cold today. I don't wear my overcoat, ________.
A．though
B．in the end
C．although
D．as a result
单项选择题
Look! The house's ________ fire. Let's get some help.
A．been caught
B．catching
C．caught
D．been catching
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