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单选题
Mrs. Green _____ in this university for more than 20 years when she retired from work last month.
A
has taught
B
had been teaching
C
has been teaching
D
had been taught
参考答案
参考解析
解析：
句意；当格林女士上个月退休时，她已经在这所大学教书超过20年了。当从句为一般过去时时，主句应为过去完成时，又因为主句中的teach为延续性动词，且从20多年前一直到上个月才停止，故主句应使用过去完成进行时，故B正确。
句意；当格林女士上个月退休时，她已经在这所大学教书超过20年了。当从句为一般过去时时，主句应为过去完成时，又因为主句中的teach为延续性动词，且从20多年前一直到上个月才停止，故主句应使用过去完成进行时，故B正确。
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