i have a little trouble ______english grannar.A .learn B learned c.to learn

learning
have trouble （ in） doing sth 做某事遇到困难

i don't konw what you say .
there's a group of english corner by QQ.
and the group number is 72028980,welcome to here..

C但是应该有个learning.
I have a little trouble learning english grammar

C，
因为一句话只能有一个动词，
已经有了haVe,
后面就只能加to do 了，
所以选C,

C