—Asweknow,youwon’tgobacktotheU

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—As we know, you won’t go back to the USA since you have established a research center here．But how long _____ in America?
—For almost 10 years．

A．did you study	B．have you studied
C．were you studying	D．have you been studying

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B．There; whether

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--- ________________. I’m not using it recently.

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— _____. At least you tried.

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One of the most important things in education is to let students ____ positive emotions and experience in the process of their learning.

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