He studied hard at school when he was young, ________contributed a lot to his su

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问题 He studied hard at school when he was young, ________contributed a lot to his success.

选项 A、which
B、therefore
C、that
D、what

答案 A

解析本题考查非限制性定语从句。这句话中，前面的主句被关系词替代在后面的从句中作主语，这种关系词只有which，故选A。

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