Mary had finished her homework ___the time i got home.A.until B.by C.at D.when

Mary had finished her homework ___the time i got home.A.until B.by C.at D.when
Mary had finished her homework ___the time i got home.A.until B.by C.at D.when

Mary had finished her homework ___the time i got home.A.until B.by C.at D.when
选B
Auntil后面一般跟从句,不能跟the time .表示直到……
Bby the time 是固定时间状语引导词,后面跟从句.表示到……为止,经常用完成时.这道题目还挺经典的,考试很爱考尤其是过去完成时
Cat the time 表示与此同时,不能引导时间状语从句,at the time of后面也只能跟表时代的名词短语
Dwhen可以引导时间状语,有当……时和突然的意思,后面直接加从句,不能加the time

C.at