They kept these animals in a laboratory for a year, to acclimatise them, and then challenged them with various tasks which, if performed successfully, would yield a reward of food. 

经济学人里的某一句,tasks后面的which是做什么成分?这里没看懂,希望有强者答疑一下,谢谢

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曹荣禄  
擅长:动词用法,句法问题

which, if performed successfully, would yield a reward of food. 限制性定语从句修饰tasks。

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