Did you see the traffic accident yesterday?Yes ,I saw it ____ when I ____ past the school gate.
题目
Did you see the traffic accident yesterday?Yes ,I saw it ____ when I ____ past the school gate.
A.happen;walk B.happen;was walking C.happened;walking D.happening;have walked
答案
Did you see the traffic accident yesterday?Yes ,I saw it ____ when I ____ past the school gate.
A.happen;walk B.happen;was walking C.happened;walking D.happening;have walked
B.happen;was walking
see sb do sth 所以接原型happen
而意思上是 当我正经过学校门口时看见的 又已经发生了 所以用过去进行时
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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