They have some problems ____ for the party.
题目
They have some problems ____ for the party.
A, prepare B, to prepare C, prepared D, preparing
答案是D,怎么解释?
答案
have problems in doing something
在做.的时候有麻烦或者问题,但是介词in一般省略,所以选最后一个
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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