GWD-30-Q20

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

答案是D,但是感觉D没有谓语啊,我选择A,有问题吗?

谢谢友人指点了!

有好心人回答下吗？

就是A，GWD里我没作完，但里面似乎错误很多，要相信自己！！！

（不相信也不行了，明天就要考了）

SSS ，同位语，
                can interfere  只有A合适

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