Question

－Why does the river smell terrible? －Because the water_______.

A．was polluted

B．has been polluted

C．will be polluted

D．has polluted

Answer 1

B

考查时态和被动语态。“河水闻起来为什么很难闻啊？”“因为河水已经被污染了。”句意是现在的情况，是已经发生的事情，且对现在造成了影响。故用现在完成时。故选B。