The road has to be (wide)______so that the problems of traffic jam can be solved.

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问题 The road has to be (wide)______so that the problems of traffic jam can be solved.

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答案widened

解析 根据句意,主语road与所填词之间是被动关系;又根据空格前的be可知应该填一个动词的被动式。由形容词wide派生出来的动词是widen,所以填入它的被动式为widened。
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