It hasn't been made clear ________ the new underground line is to be open to traffic.A.whenB.th

题目简介

It hasn't been made clear ________ the new underground line is to be open to traffic.A.whenB.th

题目详情

It hasn't been made clear     ________  the new underground line is to be open to traffic.
A.whenB.that
C.whatD.where
题型:单选题难度:中档来源:不详

答案

A
A 考察名词性从句。这是when引导的主语从句,it是形式主语。句意:新的地铁线路何时开放还不清楚。故A正确。

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