题目内容

More than seven in ten get angry ________ to wait longer than one minute for a web page to  be downloaded.
A．if forcedB．unless forcedC．once forcingD．until forcing
A
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。
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