Sir you be sitting in this chair! It is just for women with children and old people only.

问题补充：

Sir, you be sitting in this chair! It is just for women with children and old people only.

A. can’t

B. shouldn’t

C. won’t

D. needn’t

答案：

A. can’t

(答案→)B. shouldn’t

C. won’t

D. needn’t

解析： 词义辨析。can’t不能；shouldn’t 不应该；won’t 不会；needn’t不必。句意：先生，你不应该坐在这把椅子上！它是为妇女儿童和老人准备的。所以选B。