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 |
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