题目

题型：不详难度：来源：

— How do you like your Englsh teacher?
— He is great. We         friends since three years ago.

A．were

B．have made

C．have been

D．have become

答案

C

解析

现在完成时态的用法。由答句中的since three years ago知，主语用现在完成时态，且动词用延续性动词，因此选C。