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

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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