询问能力的句型 — 英语选择题

放学后，Su Hai 和 Yang Ling 看到教室很脏，想问可以做什么来帮忙。下面哪一组问答是正确且规范的？ A. — What can we do? — We can cleaning the classroom. B. — What can we do? — We can clean the classroom. C. — What we can do? — We can clean the classroom. D. — What can we do? — We clean can the classroom.