Question

could you close_____ door, please?(a/an)
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Answer 1

Answer:

could you close a door , please?

Answer 2

DUDE IF YOU HAVE GIVEN ONLY THESE 2 OPTIONS THEN ANSWER CAN BE A . BUT THE BEST ANSWER WILL BE THE.

BUT ACCORDING TO YOUR QUESTION ANSWER WILL BE.

COULD YOU CLOSE A DOOR,PLEASE?

HOPE U WOULD BE ABLE TO UNDERSTAND WHAT I MEAN.