用过去时或完成时填空
题目
用过去时或完成时填空
1.___they ever ___(be)abroad?Yes,just once.
2.Your father ___just ___(finish)his work.
3.Your father ___(finish)his work just now.
4.Last term I ___(learn)many English words.
5.They___ (not read)the interesting books yet.
答案
1._Have__they ever _been__(be)abroad?Yes,just once.
2.Your father _has__just _finished__(finish)his work.
3.Your father _finished__(finish)his work just now.
4.Last term I _learnt__(learn)many English words.
5.They_haven't read__ (not read)the interesting books yet.
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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