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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