问题

_______environmental damage is done, ittakes many years for the ecosystem to recover．

A:as long as
B:If only
C:While
D:Once

正确答案是：

同类题型

She couldn’t remember names of her college classmates，but his name frequently ________ to her memory.[ ]

My uncle lives ____ 105 Huanghe StreetHis room is ____ the fifth floor

rkinson, you are wanted on______phone.—Who is calling— ______ Mr. Green. I don’t know who heis.

May I have a talk with you, sir?I’ve got importantto tell you.

He_______the book and decided that hewouldn’t buy it.