2. 公务员
  3. ___program has been developed up to this date, but none of them are economical enough to be carried out now.

___program has been developed up to this date, but none of them are economical enough to be carried out now.

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问题 ___program has been developed up to this date, but none of them are economical enough to be carried out now.
选项 A、All
B、Several
C、Either
D、Many a
答案D
解析 题干属于but连接的并列句。前半旬的谓语动词为单数，且后半句中的them指代的是program，表示的是复数的概念，因此用many a修饰名词，故选D。
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