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.manycitiesinthesouthernpartoftheunitedstateshavedifficulty______trafficflowingwhen8.manycitiesinth

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
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

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
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。