题目内容

____ do you usually go to work?

A. How
B. How much
C. How many
D. How old

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沥青混凝土压实层的最大厚度不宜大于( )cm

I think we should discourage people____ using their private cars.

A. at
B. from
C. to
D. for

热拌沥青混合料施工,纵向接缝有( )和( )两种

They are so bad ____ the environment.

A. at
B. in
C. for
D. about

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