题目内容：
If your friend refuses to return the money, __________.
A．you can remind your friend of it via e-mail B．you can lend more money to him or her
C．you must get to know why he or she needs that money
D．if you should lend money to your friend
E．you can call the police to settle the issue
F．there is no need to maintain a friendly relation with him or her
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