The policemen are very glad ______ the old people if they have any trouble.[ ]A. helpB. to help C. h
A. help B. to help C. helping D. helps
题目简介
The policemen are very glad ______ the old people if they have any trouble.[ ]A. helpB. to help C. h
题目详情
A. help
B. to help
C. helping
D. helps
答案