Many cities in the Southern part of the United States, have difficulty ______ tr

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问题 Many cities in the Southern part of the United States, have difficulty ______ traffic when it snows.

选项 A、kept
B、to keep
C、keeping
D、is being kept

答案 C

解析 have difficulty/trouble +in doing…表示“做……有困难的”。这里in可以省略。例如：She has a little trouble in learning to type．她学打字有点困难。因此四项中唯有C项符合这个要求。故C为正确答案。

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TheeconomyoftheUnitedStates,aswellasthatofmostdevelopednations,