45
(A)did
(B)that
(C)what
(D)were

附合語句變形

因為前面是過去式的動詞（grow→grew），所以後面要用同樣是過去式的did 
照樣造句可以是 I ate an apple yesterday, so did my brother. did對應到ate這個eat的過去式

As the popularity of cheerleading grew, so   45   the stunts, tumbling and skill level of the cheerleaders participating. Today competitive cheerleading is one of the most popular sports in the United States and it has become a multi-million-dollar industry that shows no signs of slowing down.

隨著啦啦隊受歡迎和普及，45 啦啦隊的特技、翻滾和技能水平也越來越高。今天，競技啦啦隊是美國最受歡迎的運動之一，它已成為一個價值數百萬美元的產業，而且絲毫沒有衰退的跡象。

附和語句(也...)

1. 肯定 too 及 so:
2. 否定 not…either 及 neither:

Ans: so + 助動詞 +主詞 B. (倒裝)

ex: She ate some cookies, and so did he.

參考 附合語句變形