(2013·江西南昌一模)It hasn't been made clear ________ the new underground line is to be open to traffic.
A．when B．that
C．what D．where
A
選A　考查名詞性從句。句意：新的地鐵線路何時開放還不清楚。句中it是形式主語，空處引導的是主語從句。根據(jù)句意可知選when。
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