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
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.

B
过去完成时用by引导的表示过去的时间短语

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答案：B
解析：by the time意为“到。。。时”，接时间状语从句。

B
到我到家的时候
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B
by the time 到---时候

BY THE TIME 正在这个时候