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 词语搭配题。
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本试题收录于: 英语题库普高专升本分类
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