问题补充：
--- Where is your mother?
--- She to Sichuan on business. She has there four times recently.
A. has gone, gone
B. has been, been
C. has gone, been
D. has been, gone
答案：
A. has gone, gone
B. has been, been
(答案→)C. has gone, been
D. has been, gone
解析：由选项可知，此题考察现在完成时的用法，现在完成时表示过去发生并且已经完成的动作对现在造成影响或后果，过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。题中has gone表明去了没回，has been表示去过，由题意得他的妈妈出差还没回来，故应选has gone，后表示他去过很多次，故应选has been，即选C
