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题目内容
（兰州理工大学-软件技术-大学英语1）
We mustn.t lose heart, must we? All the teachers are encouraging us.______
A．Yes, we must
B．Yes, we mustn.t
C．No, we must
D．No, we must
A．Yes, we must
B．Yes, we mustn.t
C．No, we must
D．No, we must
参考答案
