The lady in the sitting room be over sixty. She looks so young.A. can’tB. mustC. mayD. nee

问题补充：

The lady in the sitting room be over sixty. She looks so young.

A. can’t

B. must

C. may

D. needn’t

答案：

(答案→)A. can’t

B. must

C. may

D. needn’t

解析：肯定的推测用must或may,把握较大时用must，把握不大时用may; 否定的推测用can’t。据下文She looks so young .可知那位女士不超过60岁，表否定的推测。故选A。