【题目】By the end of last month, some latest teaching equipment ________ to some high schools in Tibet.
A. has been sentB. was sent
C. had been sentD. would be sent
在线课程【答案】C
【解析】
考查时态。句意：到上个月底，一些最新的教学设备已经被送往西藏的一些高中。根据句中时间状语By the end of last month可知，动作发生在过去的过去，用过去完成时。故选C。