1:The book was so interesting that he had read it for three hours ___ he realized it. A.when B.until C.after D.before 2.Who cleaned the blackboard yesterday,Dick? -John___. A.cleaned B.did C.does D.is
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![1:The book was so interesting that he had read it for three hours ___ he realized it. A.when B.until C.after D.before 2.Who cleaned the blackboard yesterday,Dick? -John___. A.cleaned B.did C.does D.is](/uploads/image/z/10912136-32-6.jpg?t=1%EF%BC%9AThe+book+was+so+interesting+that+he+had+read+it+for+three+hours+___+he+realized+it.%E3%80%80A.when+%E3%80%80B.until+C.after+D.before+%E3%80%80%E3%80%802.Who+cleaned+the+blackboard+yesterday%2CDick%3F%E3%80%80%E3%80%80-John___.%E3%80%80%E3%80%80%E3%80%80A.cleaned%E3%80%80B.did%E3%80%80%E3%80%80C.does%E3%80%80%E3%80%80D.is)
1:The book was so interesting that he had read it for three hours ___ he realized it. A.when B.until C.after D.before 2.Who cleaned the blackboard yesterday,Dick? -John___. A.cleaned B.did C.does D.is
1:The book was so interesting that he had read it for three hours ___ he realized it. A.when B.until C.after D.before 2.Who cleaned the blackboard yesterday,Dick? -John___. A.cleaned B.did C.does D.is 还有,表示在物体的外部的东部怎么表达?
1:The book was so interesting that he had read it for three hours ___ he realized it. A.when B.until C.after D.before 2.Who cleaned the blackboard yesterday,Dick? -John___. A.cleaned B.did C.does D.is
第一个选D,有had了,这是过去的过去完成时,与before搭配.
第二个选B,did 代指 cleaned the blackboard(擦黑板)这件事,因为是昨天发生的,所以用过去时did.