he is not old enough to drive a car,but he wished he（）
题目
he is not old enough to drive a car,but he wished he（）
did
were
was
had
说原因好么
答案
选were.这是对现在的虚拟语气.因为现在他is not old enough,所以他希望 were (old enough).只不过因为前面已经出现过old enough,所以这里省略了
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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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