2. 外语
  3. It is not until recently ______ there are many different kinds of hearing defects.

It is not until recently ______ there are many different kinds of hearing defects.

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问题 It is not until recently ______ there are many different kinds of hearing defects.
选项 A、have the scientists discovered
B、the scientists have discovered
C、that the scientists have discovered
D、that will the scientist have discovered
答案C
解析 本句是强调句式，所以原本由于否定词在句首需要主谓颠倒的句式，在强调句里就不需要再颠倒了。
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