问题
选择题
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
C．not to have
D．to not have one
答案
答案：B
此句考查不定式短语的省略结构，通常情况下不定式中的“to”要保留，其后的不定式短语省略，或者不定式短语用do so 替换，故选项B是正确的。