______ matter in one form is transmuted to another form, a phase change is said to have taken place.

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问题 ______ matter in one form is transmuted to another form, a phase change is said to have taken place.

选项 A、Such
B、Then
C、Whenever
D、Seldom

答案C

解析 whenever可以引导时间状语从句,相当于every time或each time,比when引导的时间状语从句更具强调意味,作“每当”讲,如:Whenever that man says‘To tell the truth’,I suspect that he is about to tell a lie.每当那个人说“说实在的”,我就知道他就要说谎了。In either case,whenever atoms are changed,energy is released.在任何一个情况下,每当原子发
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