Mary had finished her homework ____ the time I got home.

Mary had finished her homework ____ the time I got home.

题目
Mary had finished her homework ____ the time I got home.
A.until B.by C.at D.when
答案
Mary had finished her homework (by,截止) the time I got home.
我到家的时候,玛丽已经完成作业了.
by the time+从句,表示截止到某时,在完成时态中作时间状语.
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