at the time 可以做连词用吗he became a doctor （by） the time he is 31.by那个空可以填at吗
问题描述：
at the time 可以做连词用吗
he became a doctor （by） the time he is 31.by那个空可以填at吗
答
at the time 可以做连词用吗
he became a doctor （by） the time he is 31.by那个空可以填at吗