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【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

【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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