They_____ the classroom now.A.are cleaning all B.are all cleaning_英语解答

They_____ the classroom now.A.are cleaning all B.are all cleaning C.all are cleaning
为什么?

人气：210 ℃　时间：2020-03-24 05:47:04

解答

B
all一般放be动词,助动词,情态动词后,实义动词前