问题补充:
--- Shall we John to help us with the project?
--- I don’t think it’s a good idea. He has too much work to do.
A. have
B. make
C. ask
D. let
答案:
A. have
B. make
(答案→)C. ask
D. let
解析:四个选项的用法分别是:have sb do,make sb do,ask sb to do;let sb do,都是“让某人做某事”。根据to help可知,应该用ask。所以本题选C。