She must be at the railway station at 9 o’clock ?A. mustn’t sheB. must sheC. ought she?D.

问题补充：

She must be at the railway station at 9 o’clock,?

A. mustn’t she

B. must she

C. ought she?

D. need she

答案：

(答案→)A. mustn’t she

B. must she

C. ought she?

D. need she

解析：must表示“必须”时，反问形式用“mustn’t /needn’t”。