More than seven in ten get angry to wait longer than one minute for a web page to be down

问题补充：

More than seven in ten get angry to wait longer than one minute for a web page to be downloaded.

A. if forced

B. unless forced

C. once forcing

D. until forcing

答案：

(答案→)A. if forced

B. unless forced

C. once forcing

D. until forcing

解析：考查省略结构。if forced = if they are forced。句意：超过十分之七的人会生气，如果他们等待网页下载超过一分钟。