（題文）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

D 【解析】句意：我們的數(shù)學(xué)老師在我們學(xué)校教了20年。他在25歲時來到這里。第一句指到現(xiàn)在已經(jīng)20年，因此用完成時；第二句有確切的過去的時間狀語，因此用一般過去時。故選C。
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