What is the right choice here? and why?
I can't do my homework because I ( lost - have lost - had lost ) my notebook.
I can't do my homework because I have lost my notebook. (This sentence suggests that sometime in the past -- and you're not sure when, exactly -- you lost your notebook, and it also emphasizes the fact that your having lost the notebook has a direct effect on right now and your inability to do your homework. ") I can't do my homework because I lost my notebook.
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I can't do my homework because I have lost my notebook. (This sentence suggests that sometime in the past -- and you're not sure when, exactly -- you lost your notebook, and it also emphasizes the fact that your having lost the notebook has a direct effect on right now and your inability to do your homework. If you were to speak this sentence, you wo would probably turn "I have" into the contr