问题
选择题
---That must be a mistake. ---No, it ___ a mistake.
A．must not be
B．needn’t be
C．cannot be
D．may be not
答案
答案：C
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---That must be a mistake. ---No, it ___ a mistake.
A．must not be
B．needn’t be
C．cannot be
D．may be not
答案：C