hard is the key to success. A．To workB．WorkC．WorkedD．Works 题目和参考答案——青夏教育精英家教网——

题目内容

________ hard is the key to success.

A．To work

B．Work

C．Worked

D．Works

A

动词不定式主语，其他词不能单独用作主语，故选A。

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