— Look at the boy playing basketball on the ground. Is it George?— It be him. He told me

问题补充：

— Look at the boy playing basketball on the ground. Is it George?

— It be him. He told me he would play basketball after class, but he’s not sure.

A. mustn’t

B. must

C. can’t

D. may

答案：

A. mustn’t

B. must

C. can’t

(答案→)D. may

解析：mustn’t 禁止，一定不；must必须，一定； can’t不能，可能不；may可以。句意：看这个在操场上打篮球的男生，是乔治吗？——不可能是他。他告诉我他会在课后打篮球，但是他不确定。情态动词之间的最大区别就是表达语气的不同，结合语境可知选D。