2. 外语
  3. They recommended______smaller heating and cooling systems.

They recommended______smaller heating and cooling systems.

admin2014-08-25  36
问题 They recommended______smaller heating and cooling systems.
选项 A、to use
B、to be used
C、being used
D、using
答案D
解析 本题考查recommend的用法，recommend doing sth．意为“建议做某事”。
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