He _ finish his homework _ his Dad came back.A.not; until B.didn't; untiHe _ finish his homework _ his Dad came back.A.not; until B.didn’t; until C.won’t; before D.isn’t; after
问题描述：
He _ finish his homework _ his Dad came back.A.not; until B.didn't; unti
He _ finish his homework _ his Dad came back.A.not; until B.didn’t; until C.won’t; before D.isn’t; after
答
B, (not .... until... 直到。。。才。。。) 原文意思：直到他爸爸回来他才写完家庭作业。
爸爸回来是过去发生的动作，他写作业是在爸爸回来之后，作业现在已经完成，也是过去完成的事情。所以用didn't ....until
答
B didn't and until
答
B
not .until 知道.才 .
他直到他爸爸回来才写完作业