There were a lot of cars parking along the street and the fire trucks couldn't pass through,_____it more difficult for the firemen to control the fire.a,make b,making c,made d,to make

问题描述:

There were a lot of cars parking along the street and the fire trucks couldn't pass through,_____it more difficult for the firemen to control the fire.
a,make b,making c,made d,to make

b,making
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B
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