The children _____ a P.E.class on he playground when it suddenly began to rain.
题目
The children _____ a P.E.class on he playground when it suddenly began to rain.
A.have B.are having C.had D.were having
答案
D,过去进行时
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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