用所给动词的正确形式填空 He ——(teach) there since he came to this city

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用所给动词的正确形式填空 He ——(teach) there since he came to this city

has taught
接时间状语从句 主句的谓v.用现在完成时,而且须是延续性动词;从句的谓v.用一般过去时,而且须是终止性动词.

has taught

has been teaching

He —had been teaching—(teach) there since he came to this city

has been teaching

had taught
有不会的可以再问我