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

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

选项

答案widened

解析 根据句子结构,这里需要一个动词,wide的动词形式为widen,意为“加宽,变宽”,又因为这是一个被动结构.所以应该用过去分词widened。“-en”除了可做动词性前缀以外,还可用于词尾,也生成动词,比如:soft--soften(使软化);fast--fasten(使固定)等。
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