Question

The naughty boy had wanted to play football with the kids in the street, but his parents warned him ______.

1. A.
   not to
2. B.
   not to do
3. C.
   to do
4. D.
   of doing

Answer 1

A
试题分析：考查不定式的省略：句意：调皮的男孩想和街上的孩子踢足球，但是他的父母警告他不要（踢球）。这是省略句，完整的是his parents warned him not to play football。不定式的动作如果前面出现了，可以省略动词do，但是to要保留。选A。
考点：考查不定式的省略
点评：为避免重复，有时可用不定式符号to来代替整个动词不定式(短语)。但是如果动词是be动词或have，就不能省略。