2. 外语
  3. The twentieth century has been a period of enormous growth in mathematical research and in the number of mathematicians and fiel

The twentieth century has been a period of enormous growth in mathematical research and in the number of mathematicians and fiel

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问题 The twentieth century has been a period of enormous growth in mathematical research and in the number of mathematicians and fields ______them.
选项 A、they require
B、requiring
C、require
D、as required
答案B
解析
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