Many cities in the southern part of the United States have difficulty______traff

游客2024-01-18  18

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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