单项选择题

Everyone here will thank the fire-workers for the things they have done to prevent fires______ the environment safer.

A．making
B．from making
C．to make
D．made
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单项选择题
—Would you like to come to dinner tonight —I'd like to, ______I'm too busy.
A．and
B．so
C．as
D．but
单项选择题
—Do you like working as a waiter —Yes, but I get fired______the whole day.
A．with standing
B．from standing
C．to have stood
D．of standing
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