The barrier of language keeps many scientists in prolonged ignorance of work of

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问题 The barrier of language keeps many scientists in prolonged ignorance of work of immediate importance to them ______at present in many countries.

选项 A、doing
B、to be done
C、having done
D、being done

答案 D

解析此题考查非谓语动词的用法，根据题意的逻辑被动关系进行判断。

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