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Although medical science________ control over several dangerous diseases, what worries us is that some of them are returning.

A．achieved	B．has achieved
C．will achieve	D．had achieved

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--- I’m sorry. I ___________ at you the other day.
--- Forget it. I was a bit out of control myself.

A．shouldn’t shout	B．shouldn’t have shouted
C．mustn’t shout	D．mustn’t have shouted

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A．which

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A．Whatever

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C．However

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A．covering; fallen

B．covered; falling

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The old man made ______ clear that he would retire soon.

A．that

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