—Whydoesthelakesmellterrible?—

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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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A．when; will come	B．after; will come
C．since; comes	D．before; comes

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A．lay; lieing	B．laid; lying
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A．control

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C．exchange

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–You ____ have it next Friday.

A．could

B．shall

C．must

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—How is the debate of your essay?
—It ____ well, but I ____one of the key points.

A．might work; hadn’t forgot	B．needn’t have worked; forgot
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