Question

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

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。