The barrier of language keeps many scientists in prolonged ignorance of work of immediate importance to them ______at present in many countries.
A.
doing
B.
to be done
C.
having done
D.
being done
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【简答题】Questions 5-7 42 42.mp3: Listen to the next part of the recording and complete the sentences.
Write only TWO WORDS . 5. First look up the title in the _____________. 6. The class mark is one or two le...