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Researchers have announced that the magnetic fields emitted by one manufacturer’s security surveillance system, of which type there are 200,000 worldwide, can interfere with pacemakers and that this interaction can bring on missed or irregular heartbeats, nausea, breathlessness, dizziness, and even fainting.

 

 

  1. of which type there are 200,000 worldwide, can interfere with pacemakers and that
  2. of which, worldwide, there are 200,000 of that type, and which can interfere with pacemakers, and
  3. of which type there are 200,000 worldwide, they can interfere with pacemakers and
  4. 200,000 of which type exist worldwide, interfering with pacemakers, and
  5. 200,000 of that type existing worldwide and can interfere with pacemakers, and

Answer is D, I dont understand. Mine is A.

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但D选项中interfering不是造成that后magnetic fields没有谓语与其匹配了吗?

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数词 + of + Which 构成 非限定性定语从句

interfering做伴随目的状语从句

可能there be 结构表示"自然存在的", 所以错吧...

你说呢?

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