2. 考研
  3. Making energy use completely harmless to the environment______very difficult and usually economically expensive.

Making energy use completely harmless to the environment______very difficult and usually economically expensive.

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问题 Making energy use completely harmless to the environment______very difficult and usually economically expensive.
选项 A、are
B、is
C、have been
D、shall be
答案B
解析
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