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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.
admin
2014-08-25
72
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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成人本科学位英语
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