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
考查省略結(jié)構(gòu)。if forced =" if" they are forced。句意：超過十分之七的人會生氣，如果他們等待網(wǎng)頁下載超過一分鐘。
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