2. 外语
  3. Whenever work is being done, energy ______ from one form into another.

Whenever work is being done, energy ______ from one form into another.

admin2010-02-19  63
问题 Whenever work is being done, energy ______ from one form into another.
选项 A、converts
B、converted
C、is converted
D、is being converted
答案C
解析 根据题意应用被动语句。
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