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For more than a decade, experts from across the globe ________ on the cure of the disease that way.

A．worked

B．are working

C．have been working

D．were working

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相关试题

There was nothing special about this film — it was only ______.

A．particular	B．average
C．interesting	D．strange

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I don’t like it at all. It can’t be _____.

A．better	B．worse
C．best	D．worst

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It was _____ opportunity to miss.

A．too good an	B．a too good
C．too a good	D．too good

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A ______ road goes ______ from one place to another.

A．straight, straight	B．straightly, straightly
C．straight, straightly	D．straightly, straight

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Entering the house we found him lying on the bed with his mouth _______ and eyes _______.

A．open, close	B．opened, closed
C．opened, close	D．open, closed

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