问题
选择题
— 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
答案：C
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。