Every Monday morning, students in our school would stand at attention,
题目
Every Monday morning, students in our school would stand at attention,
watching the national flag ______.
A. raising B. rising C. being risen D. being raised
答案是D,请问B为什么不对
答案
选D being raised
解析：因为国旗是不会自己升起的,是被升起的,所以要用被动语态.
Every Monday morning,students in our school would stand at attention,watching the national flag being raised．
每周一早晨,我们学校的学生会立正观看升国旗.
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．
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