He must submit a concrete energy ______that is to be carried out soon.

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问题 He must submit a concrete energy ______that is to be carried out soon.

选项 A、plan
B、planning
C、plans
D、planned

答案A

解析看到复合名词，同时后面有that is，就必须能够迅速判断填入答案的单复数。这样的题目，意外做错的情况不少。

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