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三道高中英语单选题No one seemed___the 25-year-old man the bad news un

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三道高中英语单选题
No one seemed___the 25-year-old man the bad news until he sat down on the bench.
A.telling     B.having told    C.to tell  D.to have told
Only when you ___this book will you know why so many children like it so much,
A.have read    B.read    C.will read    D.had read
He was supposed ___home a loaf of bread,but it slipped his mind.
A.to bring   B.to have brought    C.bringing   D.having brought
注:已知答案分别是选D,A,B;但为什么不选C,B,
C时态不对,tell the 25-year-old man the bad news发生在sat down on the bench之前,从句中要用完成时

和第一题同理,只有在读过这本书之后才能know why so many children like it so much
记得回家路上带面包这件事只存在于他忘记这件事之前,和前两题同理

再问: 1题是属于not until结构吗?怎么翻译这句话比较好?2题B选项read如果是过去时不也是在know之前吗?谢谢。
再答: 是的 【在这个二十五岁的年轻人在长椅上坐下来之前,似乎没人告诉他这个坏消息】 不,要表现这样的先后关系只能用完成时,只能是先行后续的