语法题请分析B,C,D里选哪个谢谢
题目
语法题请分析B,C,D里选哪个谢谢
No matter how frequently( ),the works of Beethoven always attract a large audience.
A.performing
B.to be perforned
C.performed
D.being performed
答案
C就可以了,C和D都表被动,但是D有（正在进行中）的意思.
原句是no matter how frequently they are performed:C
原句是no matter how frequently they are being performed:D
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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