帮忙用was/were doing .when ; be about to do.when;had just done.when造句,
题目
帮忙用was/were doing .when ; be about to do.when;had just done.when造句,
答案
They were talking when the teacher came in.老师进来的时候他们正在讲话I was about to wash my face when he came back.当他回来的时候我正要去洗脸I had just finished the homework when the telephone rang.电...
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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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