问题

Why does the lake smell terrible?—Because large quantities of water_______________
A:have polluted
B:is being polluted
C:has been polluted
D:have been polluted
B:is being polluted
C:has been polluted
D:have been polluted
正确答案是:
同类题型
It is a long time since I last saw you This sentence means _______
What’s your favorite TV show ——_______favorite TV show is I am a singer.
Much to our surprise, his new book became an____ success.[ ]
The holiday we had been looking forward to _________ at last
I _____ you would come today. You _____ me a phone call in advance.