问题补充：
The boy wanted to ride his bicycle in the street, but his mother told him .
A. not to
B. not to do
C. not do it
D. do not to
答案：
(答案→)A. not to
B. not to do
C. not do it
D. do not to
解析：不定式的省略要保留到to,否则就完整地表达，如:…but his mother told him not to do so.
