it has not been made clear when it is to be opened to traffic中的wh_英语解答

it has not been made clear when it is to be opened to traffic中的when换成that

人气：284 ℃　时间：2020-03-26 12:51:17

解答

那意思就变了
用when表示那个时间不明确
that表示交通运输开放这个事情不明确了