By the time Jack returned home from America, his son __________ from college.
A．graduateB．has graduatedC．had graduatedD．had been graduated
C
考查時(shí)態(tài)。By與完成時(shí)連用，本題by后面是表示過(guò)去的時(shí)間，所以使用過(guò)去完成時(shí)。句意：到JACK回到美國(guó)的時(shí)候，他兒子已經(jīng)大學(xué)畢業(yè)了。
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