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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专业英语四级

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