It hasn"t been made clear ________ the new underground line is to be open t
题型：不详难度：来源：
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 |
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。 |
举一反三
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|
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