I'm sorry you so long, but it' ll still be some time before Jim gets back．
A. wait
B. waited
C. had waited
D. have been waiting
网友回答
A. wait
B. waited
C. had waited
(答案→)D. have been waiting
解析：wait从说话之前（过去）就开始了一直持续到现在，再根据下文t' ll still be some time before Jim gets back可知动作还会继续下去。句意：很抱歉让你等了这么久，但是在Jim还要过一段时间才回来（你还得等）