◎ 题干
The road is designed for only motor vehicles, so once_____ , bicycles are not allowed to go along it.

[     ]

A. opens
B. having opened
C. opening
D. opened
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The road is designed for only motor vehicles, so once_____ , bicycles are not allowed to go along it. [ ]A. opens B. having opened C. opening D. opened …”主要考查了你对  【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。