Beijing has many buses that there is often a traffic jam in rush hours.A. soB. veryC. to

问题补充：

Beijing has many buses that there is often a traffic jam in rush hours.

A. so

B. very

C. too

D. much

答案：

(答案→)A. so

B. very

C. too

D. much

解析：“北京有这么多的车辆，以至于上下班高峰期常会出现交通阻塞。”too常用于“too... to...”句型；so常与that，构成“so... that ...”如此......以至于......句型。故选A。