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(dòng)詞的時(shí)態(tài)。for 20 year是現(xiàn)在完成時(shí)的時(shí)間標(biāo)志。因此第一空要填has taught；后半句時(shí)間狀語是when he was 23 years old，動(dòng)詞用一般過去時(shí)，因此天came.故答案為D。
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