Bytheyear2020scientistsalotofr

By the year 2020 scientists _____ a lot of research on AIDS.

A．had done

B．do

C．are doing

D．will have done

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A．didn't realize

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A．an; the

B．an; a

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A．attends

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– Not yet… Look, there ____ the rest of our visitors!

A．comes

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A．seat

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