【题目】It hasn’t been made clear ______ the new underground line is to be open to traffic.
A．when B．that C．what D．where
在线课程【答案】A
【解析】此处it是形式主语，真正的主语是when引导的主语从句。句意：新的地铁线路何时开放还不清楚。将所有选项代入句中，只有when符合语境。
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