It hasn't been made clear     ________  the new underground line is to be open to traffic.
A．whenB．that
C．whatD．where
A
A 考察名詞性從句。這是when引導(dǎo)的主語(yǔ)從句，it是形式主語(yǔ)。句意：新的地鐵線路何時(shí)開(kāi)放還不清楚。故A正確。
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