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2.“Until recent times unknown to man” in paragraph I means that ________.
A.no man has been to the Antarctica recently
B.we knew nothing about this large continent till that time
C.a great landmass is still not known to man till today
D.our knowledge of Antarctica was very limited at the time this article was written

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出自：新疆师范大学2021级学生第一学期结业课程考试《大学英语》

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