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The time has come ___________ we can make extensive use of n

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The time has come ___________ we can make extensive use of nuclear energy.
A.as B.when C.while D.since
The time has come ___________ we can make extensive use of n
答案: B when 引导定语从句.其中time 为先行词.由于定于从从句we can.结构完整,必须使用关系副词.其实,这个定语从句的位置应该放在the time 的后面.正确的语序应该是:
The time when we can make extensive use of nuclear energy has come.