题目内容：

The boys first made some noise, and then they became___
A. more and more noisily B. noisier and noisier
C. noisy and noisier D. more and more quiet
选哪个?why?

优质解答

B.become是系动词,其后加形容词作表语.
noisy是形容词,它的比较级是noisier,表示“越来越.”时,两个比较级用and相连,故选 B. noisier and noisier