Whatever happens, you should keep on what you ____until you are completely successful.

问题描述:

Whatever happens, you should keep on what you ____until you are completely successful.
A.startB.have started
C.had started D.has happened;have lost

选B
翻译:无论发生什么,你都应该坚持你已经开始做的事情,直到成功完成.
开始做的事情发生于keep on之前,但是到此时还没完成,还要继续下去.符合现在完成时的语法规则,因此选择B.