未知题型
The time has come _____ we make extensive use of nuclear energy.
A.When
B.while
C.as
D.since
A.A.WhenB.while
C.as
D.since
【参考答案】
A
答案为A。when引导的定语从句修饰 time,有时为了使句子平衡,也就是使主语不必过长,而把定语从句或同位......
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