大全 139

139.      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

in (b), whether the chips’ circuits more complex, has omitted the verb "have become"? if yes, why is that right?

be/become做谓语的时候，如果和前面动词部分完全一样，可以省略。OG也有很多这样的例子。