My father didn't give up smoking until the doctor asked him to do so.(保持原句意思)My father ______ smoking ________ the doctor asked him to do so.

问题描述:

My father didn't give up smoking until the doctor asked him to do so.(保持原句意思)
My father ______ smoking ________ the doctor asked him to do so.

我认为狠可能kept although。应该是较简单的连词!

quitted/since
my father quitted smoking since the doctor ask him to do so.

still unless

has quitted
since
since前加完成时态,后加过去时态