问题
选择题
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
答案
答案：D
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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：D