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

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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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