问题补充:
---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
答案:
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。