问题补充：
The doctor thought would be good for you to have a holiday.
A. this
B. that
Cone
D. it
答案：
A. this
B. that
C. one
(答案→)D. it
解析：考查 代词。 句义：医生认为度假对你有好长。A this 这 B that 不做形式主语或者宾语，带特指的不可数名词或者单数可数名词。C one =a/an + 单数可数名词，D it
做形式宾语，代替真正宾语to have a holiday ,所以D正确
