2. 专升本
  3. _____work is being done, energy is being converted from one form into another.

_____work is being done, energy is being converted from one form into another.

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问题 _____work is being done, energy is being converted from one form into another.
选项 A、Whichever
B、However
C、Whenever
D、Whatever
答案C
解析
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