By the time Jack returned home from England, his son.      from college.
A．graduatedB．has graduated
C．had beenD．had graduated
D
考查動(dòng)詞時(shí)態(tài)，By the time 截止到過去某時(shí)間為止做了某事，用過去完成時(shí)態(tài)。 A是一般過去時(shí)；B是現(xiàn)在完成時(shí)；C是過去完成進(jìn)行時(shí)。根據(jù)句子意思“截止到Jack從英國(guó)返家，他的兒子已經(jīng)大學(xué)畢業(yè)了。
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