— Why does the lake smell terrible?— Because large quantities of water ____.
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A
have polluted
B
is being polluted
C
has been polluted
D
have been polluted
推荐题目
Mary keeps talking about the party. She had a very good time,_______?
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A
hadn’t she
B
had she
C
didn’t she
D
did she
The young ________ the hope of our country.
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A
is
B
are
C
were
D
was
 In that train accident, _____ who were killed was more than 2000.
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A
a number of people
B
the number of people
C
many people
D
a large number people