Many cities in the southern part of the United States have difficulty ______ traffic flowing when it snows.

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

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

答案B

解析 句意:美国南部的许多城市在下雪天都很难保持交通顺畅。词语搭配题。have difficulty in doing sth.为固定表达,意为“做某事是困难的”,in可以省略,所以A、C项都不正确。另外,这里是说下雪天很难保持交通顺畅,是主动而不是被动,所以选B。
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