Using plural invariables: A traffic accident often occurs at a crossroads.

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问题 Using plural invariables:
A traffic accident often occurs at a crossroads.

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答案Traffic accidents often occur at crossroads。

解析 名词词组A traffic accident中accident为中心词;traffic为名词,作定语修饰accident,冠词A也作修饰语;改为复数形式时冠词A要去掉;traffic作定语不变,只要在accident后加“s”即可;名词词组a crossroads中因为crossroads为单复数同形的词,所以只要去掉冠词a即可。同时也需将第三人称单数谓语动词occurs变为原形。
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