The birth planning policy allows my parents to have a second child because of my disabilit

问题补充：

The birth planning policy allows my parents to have a second child because of my disability, but to look after me, they chose .

A. not to do

B. not to have

C. not to

D. to not have one

答案：

A. not to do

B. not to have

(答案→)C. not to

D. to not have one

解析：C 考察不定式的省略结构。通常不定式中的to要保留，其后的不定式短语可以省略，或者使用不定式do so来替换。故C正确。