Question

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

Answer 1

A

解析:

can表示“可能性”，通常用于否定句或疑问句中，且有时还带有“惊奇、不相信”等感情色彩。