2. 外语
  3. Never before______ so many people applied such abstract mathematics to so great a variety of problems.

Never before______ so many people applied such abstract mathematics to so great a variety of problems.

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问题 Never before______ so many people applied such abstract mathematics to so great a variety of problems.
选项 A、have
B、had
C、has
D、have had
答案A
解析 本题综合考查倒装句、时态和主谓一致，never放句首要求主谓倒装，never before是现在时的时间状语，so many people是句子的主语，所以谓语用have。题意为，从前从没有这么多的人把如此抽象的数学应用于这么多种问题当中。
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