---What do you think worries him so much? ---- .
A. He didn’t pass the exam
B. His father is seriously ill
C. Lost his bike
D. What Jim said just now
网友回答
A. He didn’t pass the exam
B. His father is seriously ill
C. Lost his bike
(答案→)D. What Jim said just now
解析：上句的意思为：你认为什么使他如此的担忧？可知是对主语进行提问。从四个选项中看出，只有D能做主语，用what引导的名词性从句做主语，完整形式为What Jim said just now worries him so much.所以选D。