By the time Jack returned home from England,his son ________ from college.(2011·遼寧)
A.graduatedB.has graduated
C.had been graduatingD.had graduated
D
考查時(shí)態(tài)。句意:杰克從英格蘭回到家時(shí),他的兒子已經(jīng)大學(xué)畢業(yè)了。by the time...“到……的時(shí)候”引導(dǎo)時(shí)間狀語(yǔ)從句時(shí),如果從句的謂語(yǔ)動(dòng)詞用一般過(guò)去時(shí),主句的謂語(yǔ)動(dòng)詞要用過(guò)去完成時(shí)。
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