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. The plan    ___ just because people were unwilling to co-operate（合作）。

    A. broke down             B. pulled down         C. turned down           D. put down

The plan    ___ just because people were unwilling to co-operate（合作）。

    A. broke down              B. pulled down

C. turned down             D. put down

. The plan    ___ just because people were unwilling to co-operate（合作）。