-------What is it made Carl determined to give up smoking?
-------Watching how his father died in pain from lung cancer.
A. which
B. how
C. who
D. that
网友回答
A. which
B. how
C. who
(答案→)D. that
解析：考查强调句型的特殊疑问句形式。其结构为：疑问词+is it that+其他...? 故填that。句意：——是什么使carl决定放弃抽烟？——看到他父亲死于肺癌的痛苦。