Mr. Bush is on time for everything. How it be that he was late for the opening ceremony ?

问题补充：

Mr. Bush is on time for everything. How it be that he was late for the opening ceremony ?

A. can

B. should

C. may

D. must

答案：

(答案→)A. can

B. should

C. may

D. must

解析：can 这里表示“惊异，怀疑”。句意是：布什先生事事准时。他怎么竟然在开幕式上迟到了。