Our math teacher ______ in our school for 20 years and he _____ here when he was 23 years old.
A．has taught, has comeB．taught, comes
C．taught, cameD．has taught, came
D
考查動詞的時態(tài)。for 20 year是現(xiàn)在完成時的時間標志。因此第一空要填has taught；后半句時間狀語是when he was 23 years old，動詞用一般過去時，因此天came.故答案為D。
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