单项选择题

A．must
B．should
C．have to
D．had better
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单项选择题
A．How to solve problems.B．Someone who will listen to them.C．Someone whom they can rely on.D．What a real friend should be.
A．How to solve problems.
B．Someone who will listen to them.
C．Someone whom they can rely on.
D．What a real friend should be.
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