我对这些题目的答案表示质疑： 1.I've looked in my purse, on the dresser, in

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我对这些题目的答案表示质疑： 1.I've looked in my purse, on the dresser, in my coat pocket, and on all of the tables in the house, but I can't find my keys anywhere. They(lose)_________. 这道题我填的had been lost,答案确是are lost。这道题说的是我已经找过了我的钱包里、大衣兜里、屋子里所有的桌子，但是我找不到钥匙，他们丢了。可是钥匙是我找之前就丢的对么？我找后才发现不见的。这道题中的找（h*e looked）用的是现在完成时，要是丢了事发生在这之前，不应该用过去完成时么？还有钥匙不会自己就丢了，是被人弄丢的，对么？应该用被动！ 2.Mark is a gennius. By the time he graduated, he(offer)_______jobs by a dozen computer companies. 我填的was offered，答案是had been offered，为什么要一定过去完成被动？我就写一半过去被动不行？过去完成被动更注重强调的是过去完成的事情对现在的影响的对么？题目也没说MARK他毕业时被提供的工作相对现在的影响啊！ 3.When I(finish)_______my work, I'm going to take a walk. 我填的finished,答案是原型。请解释一下为什么？ 4.After the best papers(return)_______to the students in class tomorrow, the students(give)______their next assignments. 两空我都填的will be done的形式，第二个对了，第一个却是are returned。why？不是说明天才发测试卷子吗？咋用的一般完成时？
老师，求解求解。。。
我的疑惑已经详细描述，请详细解答。谢谢~~~

解题思路：英语要保持时态的前后一致。时态一致表示句子的时态必须从头到尾都是一样的。即：谓语动词的时态与时间状语的时态一致；从句的谓语动词时态与主句保持一致
解题过程：
1.I've looked in my purse, on the dresser, in my coat pocket, and on all of the tables in the house, but I can't find my keys anywhere. They(lose)_________.
填are lost。因此语境描述的是现在情况，故不能用过去完成时，因为过去完成时表示动作发生在“过去的过去”。 be lost 表示“丢失的”状态。
2.Mark is a gennius. By the time he graduated, he(offer)_______jobs by a dozen computer companies.
By the time是过去完成时的标志词。
3.When I(finish)_______my work, I'm going to take a walk.
填finish。When引导的时间状语从句，可以遵循“主将从现”的原则。
4.After the best papers(return)_______to the students in class tomorrow, the students(give)______their next assignments.
After引导的时间状语从句也可以遵循“主将从现”的原则。
最终答案：如上

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