---Mark broke his leg when he was playing football.
题目
---Mark broke his leg when he was playing football.
---_____was that?
A.since when B.since when ago C.how long ago
C.
答案
1AB的用法不对,since when 本身就是语法错误了,不可以用2how long ago was that那是多久以前了?i wonder how long ago this school was built我想知道这学校多久以前建造的?加个age就是表示强调多久以前做什么事因为...
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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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