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-Why does the lake smell terrible? -Because large quantities of water . [ ] A. h

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-Why does the lake smell terrible? -Because large quantities of water . [ ] A. h

-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

试题答案

答案:D