- 试题详情及答案解析
- —Why does the river smell terrible
—Because large quantities of water________．| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
- 答案：D
- 试题分析：考查时态。句意：——为什么这条河这么难闻？——因为大量的水已经被污染。根据语境可知，大量的水已经被污染，故用现在完成时态的被动语态，故选D。
考点：时态