Since I(finish)______ reading the book, I can return it to the library.have fini

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问题 Since I(finish)______ reading the book, I can return it to the library.

选项

答案 have finished

解析本题考查的是since引导的原因状语从句，可译为“既然……”。根据题意，书应该已经被阅读完毕，所以过去完成的动作对现在还有影响，故使用现在完成时。因此，需填入have finished。

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[originaltext]M:Haveyoufinishedyourwork?W:Notyet.Ihavetostayupto