They recommended______smaller heating and cooling systems.A、to useB、to be used

游客2025-03-09 44

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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