You’ll never guess who I met today—my old teacher! We for 20 years.A. don’t meetB. haven

问题补充：

You’ll never guess who I met today—my old teacher! We for 20 years.

A. don’t meet

B. haven’t met

C. hadn’t met

D. couldn’t meet

答案：

A. don’t meet

(答案→)B. haven’t met

C. hadn’t met

D. couldn’t meet

解析：用现在完成时表示从过去持续到现在的一段时间。