we must keep the classroom______- A.clean B.to clean C.cleaning D.cleaned
问题描述:
we must keep the classroom______- A.clean B.to clean C.cleaning D.cleaned
答
A clean
keep sth. adj. 是保持某物怎么样的意思,如:keep fish fresh 保持鱼新鲜,keep classroom clean 保持教室干净