i'm worried about my english _______harder _______you willcatch uo with your classmates!第一个空working 还是work?为什么是work?语感告诉我是working...选work的理由是什么?

问题描述:

i'm worried about my english _______harder _______you willcatch uo with your classmates!
第一个空working 还是work?
为什么是work?语感告诉我是working...选work的理由是什么?