Why is the answer "Debo enviar" wrong for this question ________ el enlace incorrecto. I have probably sent the wrong link. (HINT: Express strong assumption/supposition). If I have understood the lesson correctly "deber + infiinitive" is used for obligation but is also accepted as a strong assumption.
In this case, "debo enviar" is incorrect because we are talking about something that happened in the past, therefore you need "debo haber enviado"/ "debo de haber enviado = I must have sent...
It's still showing an assumption but an assumption referring to the past, not the present.
I hope this clarifies it.
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