Bill has a lot of teaching experience ,has't he?--Yes,indeed_English since 1950A He's taught.B He's teaching C He was teaching D He'd taught 选什么

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Bill has a lot of teaching experience ,has't he?--Yes,indeed_English since 1950A He's taught.B He's teaching C He was teaching D He'd taught 选什么
Bill has a lot of teaching experience ,has't he?
--Yes,indeed_English since 1950
A He's taught.B He's teaching
C He was teaching D He'd taught 选什么

Bill has a lot of teaching experience ,has't he?--Yes,indeed_English since 1950A He's taught.B He's teaching C He was teaching D He'd taught 选什么
——Bill has a lot of teaching experience,hasn't he?
——Yes,indeed he has taught since 1950.
或者He has been a teacher since 1950/ He has been in school sine 1950.
时态为现在,Bill has a lot of .指的是现在,所以回的也是现在,对现在造成影响了,
以since 引导的时间状语从句,主句为完成时,又因为是现在的,所以用现在完成时.

D 过去完成进行时