私人军火生意:英语问题3!

来源:百度文库 编辑:查人人中国名人网 时间:2024/04/30 01:15:29
___ the habitat of species is changed or destoryed, the animal has to find a new home

A though
B where
C after
D when

为什么?
答案是D 为什么不能是C?

D.when
时间从句

When the habitat of species is changed or destoryed
After the habitat of species has been changed or destoryed

after 要用完成式

after 特指这一种情形,发生不多见,并就事论事,前后关系明确
when 为一般情形,就是当。。发生时会怎么样,用一般时

C
意思是:在栖息地被改变或者毁坏后,动物不得不找个新家园