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

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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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