2. 外语
  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 在have difficulty(in doing sth．)句型中，in可以省略，所以A、C都不对，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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