Question

There is no difference between the two words. I really don’t know ________.

1. A.
   what to choose
2. B.
   which to choose
3. C.
   to choose which
4. D.
   to choose what

Answer 1

B
本题考查的是疑问词与动词不定式连用以及what和which的区别。英语中疑问词what和which需放在动词不定式之前，不能放在动词不定式之后，故先排除了C和D。根据题意是在两个单词中来选择，且which通常也choose搭配，显而易见A也是错误的。