—Chinese Football Team beat the team from Korea on March 22nd.—They ______ really hard. There is no

题干

—Chinese Football Team beat the team from Korea on March 22^nd.

—They ______ really hard. There is no success without effort.

A：studied

B：enjoyed

C：compared

D：practiced

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若集合{a，b，c，d}={1，2，3，4}，且下列四个关系：

①a=1；②b≠1；③c=2；④d≠4有且只有一个是正确的，试写出所有符合条件的有序数组（a，b，c，d）．

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