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

______ 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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