Allie needs to get an answer to a question about her final paper from her instructor. She should单项选择题

A

send a message and then send a follow-up every hour until it is answered.

B

send a message and wait 24–48 hours before sending a follow-up.

C

send a message three times in a row in case one of them is not delivered.

D

wait until the day before the final to send an email so the message is urgent.

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