The roads have to be ______ (wide) so that the problems of traffic jam can be so

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问题 The roads have to be ______ (wide) so that the problems of traffic jam can be solved.

选项

答案 widened

解析句子里“路”作主语，与wide之间是被动关系，所以应填入动词的过去分词，而 wide的动词形式是widen，过去分词形式是widened。

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