8.many cities inthe southern part of the united states have difficulty ______traffic flowing when8.many cities inthe southern part of the united states have difficulty ______ traffic flowing when it snows.A)keptB)to keepC)keepingD)in being kept

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8.many cities inthe southern part of the united states have difficulty ______traffic flowing when
8.many cities inthe southern part of the united states have difficulty ______ traffic flowing when it snows.
A)kept
B)to keep
C)keeping
D)in being kept

have difficulty in doing sth
have trouble in doing sth.
你可以把它看成是习惯搭配.这里不能用动词不定式.

sb. have difficulty in doing sth,介词in可以省略。keep traffic flow保持交通畅通,是人的动作。