单选题In the past 50 years, there _____ a great increase in the amount of research _____ on the human brain.A was...didB has been...to be done C was...doingD has been...done

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单选题

In the past 50 years, there _____ a great increase in the amount of research _____ on the human brain.

was...did

has been...to be done

was...doing

has been...done

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In the past 50 years, there _____ a great increase in the am

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