choose the correct option with a reason:

They did not know where they _ from.
a)had come
b)have come
c)has come
d)come

pls specify your answer with reason.

Dear student,

The correct options can be 'had come' or 'have come'.
If we choose 'had come' it means that they were not aware of where they had come from ; the action of arrival had happened in the past.
If we choose 'have come' it means that they were not aware of where they have come from ; the action of arrival has happened in the present.

I hope the explanation is of ample help to you.

Regards