Our math teacher ______ in our school for 20 years and he _____ here when he was 23 years old.
A. has taught, has come B. taught, comes
C. taught, came D. has taught, came
Our math teacher ______ in our school for 20 years and he _____ here when he was 23 years old.
A. has taught, has come B. taught, comes
C. taught, came D. has taught, came
D
解析:考查动词的时态。for 20 year是现在完成时的时间标志。因此第一空要填has taught；后半句时间状语是when he was 23 years old，动词用一般过去时，因此天came.故答案为D。