最新ps2模拟器下载:WANTING HELP

来源:百度文库 编辑:神马品牌网 时间:2024/04/28 13:17:40
It has been estimated that if the bridge were packed with cars , it’d still only be carrying a third of its total capacity.(同义句转换)
Even if the bridge were packed with cars , it could still _____ three times the load.

a. be carrying
b. be able to carry
c. only carry
d. carry
The key of the question is d. I want to know why I can’t choose b? Please explain it to me clearly.

因为前面有了"could",意思是"能够",不能再用"be able to"(也是能够),这样不就重复了吗?
记住哦,can和be able to 不能同时使用的!

用be able to与could冲突,它俩都是情态动词.