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的顺畅。havedifficulty in doing sth．为一固定表达，意为“做某事是困难的”，in可以省略，所以A，C都不正确；这里是说下雪时人们很难保持交通通畅，是主动而不是被动，所以选B。
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