What( ) when you lost the library book?A did happen B is happening C happened D was happening.

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• What( ) when you lost the library book?A did happen B is happening C happened D was happening.选哪一个 为什么选那一个 这句话应该怎么翻译
• Did you see the traffic accident yesterday?Yes ,I saw it ____ when I ____ past the school gate.A.happen;walk B.happen;was walking C.happened;walking D.happening;have walked
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• I have no idea what _____when I was asleep.A is happening B did happen C happened D was happened
• What( ) when you lost the library book?A did happen B is happening C happened D was happening.
• 句型转换.1.When he arrived ,everyone felt surprised.______ ______ was a big surprise to everyone.2.The students walked out of the classroom one after another.The students walked out of the classroom ______ ______ ______.3.They knew everything only after you told them.They knew ______ ______ you told them.单项选择.1.Could you tell me ______?A.what happened to him B.what did he happen C.what did he happen to D.what he happen2.Where ______ you ______ this winter
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• 对任意实数a,b有代数式M=a的平方加ab加b的平方减a减b加1,则M的最小值为