改错：We must keep the classroom cleaning erery day.
题目
改错：We must keep the classroom cleaning erery day.
答案
cleaning
要么改成 clean
要么改成 cleaned
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
cleaned为什么也可?是打扫的意思,但由于 教室是被打扫的,所以要用过去分词 cleaned keep classroom cleaned every day 保持教室每天被打扫
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
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