Do you have lots of problems ______ English 【单选】
题目
Do you have lots of problems ______ English 【单选】
5.Do you have lots of problems ______ English
A.learn B.to learn C.learnt D.learning
答案
Do you have lots of problems ______ English
A.learn B.to learn C.learnt D.learning
选D
【have problems (in)doing sth】做某事有困难
用动名词形式
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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