求助og12 sc94

wyyavv

94.The recent surge in the number of airplane flights has clogged the nation's air-traffic control system,to lead to 55 percent more delays at airports,and prompts fear among some officials that safety is being compromised.

C to lead to a 55 percent increase in delay at airports and prompt
E  leading to a 55 percent increase in delays at airports and prompting

E正确可以理解。我想问的是C选项的解释中说：the meaning of 55 percent increase in delay is not clear. 但E选项中又说：the phrase a 55percent increase in delays is clear and concise. CE中都是a 55 percent increase in... 为什么解释矛盾？
谢谢大家的帮助！

wyyavv

谢谢你! 明白了!!!

a514116402c

我觉得因该先看句子的结构，在看句子的表达含义；

用doing 修饰前面整个句子，而to do 显然不能。