Bob has gone to California,I hear.Oh,I wonder when he ------- A leaves B left C was leaving D has le
题目
Bob has gone to California,I hear.Oh,I wonder when he ------- A leaves B left C was leaving D has left
答案
B 我想知道他什么时候走的（已经去加州了,说明“走”这个动作已经是过去了）
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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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