用How often 造5个不同时态句子
题目
用How often 造5个不同时态句子
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How often do you have a shower?你隔多久洗一次澡?(一般现在)How often did you buy her a present when you were together?你们还在一起的时候,你隔多久给她买一次礼物啊?(过去)How often will you call on him wh...
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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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