GWD 30-22

heniyang

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.

A.    of which type there are 200,000 worldwide, can interfere with pacemakers and that
B.    of which, worldwide, there are 200,000 of that type, and which can interfere with pacemakers, and
C.    of which type there are 200,000 worldwide, they can interfere with pacemakers and
D.    200,000 of which type exist worldwide, interfering with pacemakers, and
E.    200,000 of that type existing worldwide and can interfere with pacemakers, and


answer D  

Why? Completely confused~~~ Help~~~

wenchang

AC选项can interfere和emitted组成了run-on，B选项and 和which在一起，连词连接一个从句？awkward！E选项把插入语200,000 of that type existing worldwide放到了主句中，改变了原意，排除来排除去只剩下D选项，而且作为插入语怎么读200000 of which也比of which there are 200000舒服