I soon learnt, he was English himself.A. WhatB. AsC. WhichD. That

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A. What
(答案→)B. As
C. Which
D. That
解析：考查定语从句。As指代一句话的内容，引导非限制性定语从句，可以放在句首，句中和句末。Which引导的非限制性定语从句只能放在句末，故排除。句意：我很快就知道，他是一个英国人。故B正确。