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

问题补充：

Tom’s dog became ill and died, made him very lonely.

A. this

B. that

C. which

D. what

答案：

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。