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
网友回答
(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。