( )1.Our teacher often keeps us ________ classroom every day,so we must keep our classroom选择
题目
( )1.Our teacher often keeps us ________ classroom every day,so we must keep our classroom选择
( )1.Our teacher often keeps us ________ classroom every day,so we must keep our classroom .A.clean,clean B.cleaning,cleaning C.cleaning,clean
答案
选择答案是c,有个句型是keep sb doing sth,
举一反三
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．
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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