Whydoesthelakesmellterrible?Be

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--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

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--- Alice came back home the day before yesterday.
--- Really? Where ______?

A．has she been	B．had she been
C．has she gone	D．had she gone

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They won’t buy new clothes because they ______ money to buy a new house.

A．save	B．are saving
C．have saved	D．were saving

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A．had worn	B．wore
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