Enerybody knows him.时态为?助动词?否定句?HE calls at every house in the street once a month.
题目
Enerybody knows him.时态为?助动词?否定句?HE calls at every house in the street once a month.
HE calls at every house in the street once a month.时态为?助动词?对 once a month划线提问?给某人打电话（5）种
答案
一般现在时 助动词：does 否定句为 Everybody doesn't know him.
一般现在时 助动词：does 划线提问为：How often does he call at every house in the street?
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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．
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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