题目内容
I think _______ necessary for us_________.
A. it; to keep exercising B. it’s; to keep exercising
C. it; keeping exercising D. A & B
练习册系列答案
相关题目
题目内容
I think _______ necessary for us_________.
A. it; to keep exercising B. it’s; to keep exercising
C. it; keeping exercising D. A & B