Put on more clothes . You be feeling cold with only a shirt on . A. canB. couldC. wouldD.

问题补充：

Put on more clothes . You be feeling cold with only a shirt on .

A. can

B. could

C. would

D. must

答案：

A. can

B. could

C. would

(答案→)D. must

解析：“must + be +表语”表示对现在事情的肯定推测，只用于肯定句。