成人英语三级

单选题The key __________ success is hard work and persistence.

A．on
B．to
C．for
D．of

参考答案：B进入在线模考
【译文】通向成功的关键是努力工作和持之以恒。
【解析】本题考查介词搭配。能和key搭配的介词有to和of。和of搭配时，key多指“钥匙”，而在本句中，key的意思是“关键”，只可和to搭配，故选B。

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