Many young people don't work hard, and regret it later when the opportunity is gone.They only realize it________it is too late.
A．when　B．before
C．in case　D．until
A
考查狀語(yǔ)從句。句意：很多年輕人不努力，當(dāng)機(jī)會(huì)失去的時(shí)候才后悔。他們認(rèn)識(shí)到這一點(diǎn)的時(shí)候已經(jīng)太遲了。when意為”當(dāng)……的時(shí)候”，根據(jù)句意可知，選A。
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