题目

When____, the buildings will be used as a school for children from flood areas. A. completed               B. completing              C. to be completed  D. is completed 答案：A  本题考查省略。原句为：when(they are) completed. 当主从句主语一致时，或从句主语为it，且从句中含有be 动词，则可以省略从句中的主语及be动词，构成主从句省略。

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