The time has come________we can make extensive use of nuclear energy.A、whenB、wh

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问题 The time has come________we can make extensive use of nuclear energy.

选项 A、when
B、while
C、as
D、since

答案 A

解析句意：我们可以广泛利用核能的时候到了。先行词是the time，且定语从句“________ we can make extensive use of nuclear energy”缺少时间状语，所以用when引导，故选A。

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