I have met him a long time ago. Both his name and face are very familiar.A. mayB. canC.

问题补充：

I have met him a long time ago. Both his name and face are very familiar.

A. may

B. can

C. would

D. should

答案：

(答案→)A. may

B. can

C. would

D. should

解析：may have done sth 表示对过去可能发生的事进行推测，意为“可能曾经”。