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5G smart phones are believed to work 9 a...

5G smart phones are believed to work 9 and 20 times faster than previous______________.

A.ones B.those C.them D.that

 

A 【解析】 考查代词词义辨析。句意:据认为,5G智能手机的运行速度比之前的手机快了9到20倍。A. ones泛指前面的可数名词复数;B. those那些,特指前面提到的可数名词复数;C. them他们,指代前面的可数名词复数;D. that特指前面提到的单数名词或者不可数名词。根据语境可知,此处泛指以前的smart phones,应使用ones。故选A。  
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