题文
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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