问题
选择题
Do you have any trouble _______ English grammar? [ ]
A. learn
B. learned
C. learning
D. to learn
答案
答案：C
搜题请搜索小程序“爱下问搜题”
Do you have any trouble _______ English grammar? [ ]
A. learn
B. learned
C. learning
D. to learn
答案：C