I had a little trouble _____(learn)English grammer

问题描述:

I had a little trouble _____(learn)English grammer

a.to learn b.learning b have trouble doing sth. 选b have trouble/difficult (in)doing sth

learning
have trouble/difficult (in) doing sth 做某事有麻烦/困难
我在学习语法上有点困难.