-----it be Li Ping who broke the glass?-No. It be Wu Dong who did it.A. Could; mayB.

问题补充：

-----it be Li Ping who broke the glass?

---- No. It be Wu Dong who did it.

A. Could; may

B. Can; must

C. May; must

D. Can; can

答案：

A. Could; may

(答案→)B. Can; must

C. May; must

D. Can; can

解析：考查情态动词。Can可能；must一定。句意：——打破杯子的可能是李平么？——不，一定是吴东做的。