Now 70 years old, the British physicist, Pendry can’t remember a time when he was not asking a question as a kid, joking that he ________ his parents to deathA.should torment(折磨)B.must tormentC.must have tormentedD.should have tormented
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C解析试题分析：考查情态动词与虚拟语气。句意：现在，70岁的英国物理学家Pendry记得儿时，总是被问同样的一个问题，开玩笑说他一定是折磨死了他的父母。根据joking可知，事情不是真实的，用虚拟语气。must have done一定已经做了某事；should have done sth本应该做某事。故选C。考点：考查情态动词与虚拟语气