He once worked in a company, ________ he went abroad for further study.
A.from whichB.after thatC.from thisD.after which在线课程D
解析：
句意：他曾经在某家公司工作，在那之后，他出国进修了。本题考查非限制性定语从句，先行词为前面整句话，本句中的非限制性定语从句相当于“…and after that, he went abroad for further study.”。