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

发布时间：2020-08-17 10:02:39

It hasn't been made clear           the new underground line is to be open to traffic.
A. when
B. that
C. what
D. where

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(答案→)A. when
B. that
C. what
D. where
解析：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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