Question

Mr Hu want ________ us ________．

1. A.
   teach; to sing
2. B.
   to teach; to sing
3. C.
   to teach; sing
4. D.
   teach; sing

Answer 1

B
want sb．to do sth．意为“想要某人做某事”；而teach sb．to do sth．意为“教某人做某事”。