2. 考研
  3. ______economically, one kilogram of coal can help produce a lot of things.

______economically, one kilogram of coal can help produce a lot of things.

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问题 ______economically, one kilogram of coal can help produce a lot of things.
选项 A、To use
B、Using
C、Being using
D、Used
答案D
解析 句意：如果合理地节省用煤，1千克煤可产出很多东西。煤显然是被用，所以选择D项，用过去分词短语作条件状语，表示被动语态。
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考研英语一

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