they[ ]the classroom now.are cleaing all are all cleaning all are cleaning
题目
they[ ]the classroom now.are cleaing all are all cleaning all are cleaning
答案
they[ are all cleaning]the classroom now.原因是：all得放在情态动词、助动词以及be动词后,非情助be前
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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