Tom’s dog became ill and died, made him very lonely.A. thisB. thatC. whichD. what

网友回答

A. this
B. that
(答案→)C. which
D. what
解析：句意：Tom的狗生病了，然后死了，这使得他非常的孤独。通过分析句子结构，可知这个句子中包含一个非限制性定语从句，且关系词指代整个主句的内容，故只能用which，选C。