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1,Will you please lend me manual when you ___ it.A.have fini

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1,Will you please lend me manual when you ___ it.A.have finished B.finish2,What were you up to when they came in the office?I ___for a while and was going to do some typing.A.have played B.had played 这两道题的答案分别为A和B,但我与同学都没完全理解懂.尤其是第二道题真的难以看出哪要用过去完成时
1,Will you please lend me manual when you ___ it.A.have fini
答案1:A.你在你用完之前能借手册吗?have done.现在完成时,表用完前,不是表延续,表延续时have been doing.答案2:B.在they came in the office之前就完成了,had done 过去完成时,表过去的过去.