By the time I left the school, the professor ______ that class for two years.A、h

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问题 By the time I left the school, the professor ______ that class for two years.

选项 A、has taught
B、had taught
C、will have taught
D、will teach

答案 B

解析本题考查过去完成时的用法。by the time若后接的从句是一般过去时，则主句用过去完成时；若后接的从句表示将来的时间，则主句用将来完成时。根据此原则，“毕业”是过去发生的事情，因此选项B为正确答案。

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