---That must be a mistake. ---No it a mistake.A. must not beB. needn’t beC. cannot beD.

问题补充：

---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：

A. must not be

B. needn’t be

(答案→)C. cannot be

D. may be not

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