885-20-19

As the etched lines on computer memory chips have become thinner and the chips’ circuits more complex, both the power of the chips and the electronic devices they drive have vastly increased.

(A) the chips’ circuits more complex, both the power of the chips and the electronic devices they drive have

(B) the chips’ circuits more complex, the power of both the chips and the electronic devices they drive has

(C) the chips’ circuits are more complex, both the power of the chips and the electronic devices they drive has

(D) their circuits are more complex, the power of both the chips and the electronic devices they drive have（B）

(E) their circuits more complex, both the power of the chips and the electronic devices they drive have

后半部分的主语是如何判断出来的啊？？？百思不得其解啊

As the etched lines on computer memory chips have become thinner and the chips’ circuits more complex（前面有become/be了，后面的become/be就省了）, the power of 【both the chips and the electronic devices they drive】 has

根据become，排除CD

E的所有格错，排除

A，改变了句子的意思。chips的用电量和电子设备。。。。

另外【they drive】 drive没有宾语，不知道是drive什么