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I ___you not tomore my dictionary ,not i can't find it

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I ___you not tomore my dictionary ,not i can't find it
A.asked B.had asked
我选的是B,是错误的.为什么错?
答案A为什么是对的?
答案A
强调在过去某一时刻,我们应该使用“一般过去时”.如果是B,就必须是“过去的过去”,你的语境不具备这一条件.以下情况,我们用had asked:
Tom had asked me to go to the cinama BEFORE Mary told me to meet her at the library.
(Tom先ask,然後是Mary的tell.连接词是before.)