问题

_______environmental damage is done, it takes many years for the ecosystem to recover

A:Even if
B:If only
C:While
D:Once

正确答案是：

同类题型

Glasses areand must be handled with great care.

Li Ming is a student who is easy _____ though he has some trouble _____ his lessons

I’m sorry, I am too busy to help you, but my brother canI’ve told him to—______

17— I’m sorryI ____ hurt you— Forget it

Do you think the weather is good enough for a picnic?— Yes , You can’t hope for day at this time of the year.[ ]