2. 外语
  3. It was believed that there was no limit ______ the energy resources on our earth.

It was believed that there was no limit ______ the energy resources on our earth.

admin2013-05-07  68
问题 It was believed that there was no limit ______ the energy resources on our earth.
选项 A、for
B、off
C、to
D、on
答案C
解析
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