－Why does the river smell terrible? －Because the water_______.
A．was pollutedB．has been pollutedC．will be pollutedD．has polluted
B
考查時態(tài)和被動語態(tài)�！昂铀勂饋頌槭裁春茈y聞�。俊薄耙驗楹铀呀�(jīng)被污染了�！本湟馐乾F(xiàn)在的情況，是已經(jīng)發(fā)生的事情，且對現(xiàn)在造成了影響。故用現(xiàn)在完成時。故選B。
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