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Scientists have found evidence ________ global warming caused the world's first horses to become smaller nearly 50 million years ago.

A．what	B．that
C．which	D．whether

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A．having working	B．having been working
C．has worked	D．had been worked

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To our surprise, the painting considered______ should have won the prize.

A．being copied	B．having been copied
C．to have copied	D．to have been copied

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A．have been tried

B．has been tried

C．has tried

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A．pressure

B．role

C．influence

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A．leaving out

B．making out

C．letting out

D．dropping out

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