精英家教網 > 高中英語 > 題目詳情
By the time Jack returned home from England, his son_____ from college.
A．graduatedB．has graduated
C．had beenD．had graduated
D
考察時態(tài)。根據by the time可知，該處要用完成時，因為by是完成時的標志，后面用什么時態(tài)就用什么完成時，所以，根據return可知，該處是用過去完成時
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