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Although medical science __________ control over several 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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相关试题

________ many times, but he still could not understand it.

A．Having been told	B．Tough he had been told
C．He was told	D．Having told

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Faced with a bill for $ 10,000,_________.

A．John had to take an extra job	B．the boss has given John an extra job
C．an extra job has been taken	D．an extra job has been given to John

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-----My room gets very cold at night.
-----_________________.

A．So is mine

B．So mine is

C．So does mine

D．So mine does

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At the end of the meeting, it was announced that an agreement ________.

A．has been reached

B．had been reached

C．has made

D．signed

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----She looks happy. She _______ have passed the exam.
-----I guess so. It is not difficult after all.

A．should

B．could

C．must

D．might

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