问题

If we throw away too much waste and can’t keep good ecosystem,we _________ our future.

A:must have destroyed
B:could be destroying 
C:may be destroying
D:must destroy 

正确答案是：

同类题型

This small mountain village is so perfect a place for holidays that visitors never leave it _________.

下列句子中词类活用用法相同的一组是（）

Thevisitors here are greatly impressed by the fact that_______ people from allwalks of life are working hard for_____ new Jiangsu

Julie was good at German, French and Russian, all of ________ she spoke fluently.

____________suggestion he offered! It will be of great help.