Question

Our math teacher __________ in our school for 20 years and he __________ here wh

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

Answer 1

答案D
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。