2. 外语
  3. Only recently______to realize the dangers caffeine(咖啡因)might bring to our health.

Only recently______to realize the dangers caffeine(咖啡因)might bring to our health.

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问题 Only recently______to realize the dangers caffeine(咖啡因)might bring to our health.
选项 A、that scientists began
B、have scientists begun
C、scientists have begun
D、that did scientists begin
答案B
解析 本题考查倒装结构，only放在句首要求主谓倒装。题意为，只是最近科学家们才开始认识到咖啡因可能带给我们的危害。
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