请选择ABC4H4i(T(Z5V/mTen years ago, Mr. Li _________ a teacher.*E7l*o*W+C)X)t'h)^-V4v
A. was*E7l*o*W+C)X)t'h)^-V4v
B. were*E7l*o*W+C)X)t'h)^-V4v
C. is*E7l*o*W+C)X)t'h)^-V4v