The students ( )(do) their exercise busily when Miss Smith went to check the homework she had assig
题目
The students ( )(do) their exercise busily when Miss Smith went to check the homework she had assig
接上ed yesterday.
2.I hear Jane has gone to the Holly Island for her holiday.
Oh,how nice!Do you know when she ( )(leave)?
答案
were doing
left
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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