By the time Jack returned home from England, his son_____ from college.
A．graduatedB．has graduated
C．had beenD．had graduated
D
考察時(shí)態(tài)。根據(jù)by the time可知，該處要用完成時(shí)，因?yàn)閎y是完成時(shí)的標(biāo)志，后面用什么時(shí)態(tài)就用什么完成時(shí)，所以，根據(jù)return可知，該處是用過去完成時(shí)
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