Bing Xin wrote her first article at the age of 19 and finished her last one at the age of 94. Through all those years, she _________.
A.had often studied
B.was always studying
C.studied hard
D.had always been studying
网友回答
D解析这题考查时态的用法：句意是：冰心在19岁写了她的第一篇文章，在94岁完成了她的最后一篇文章。在那些年里，她一直在学习。这里强调的是冰心在19-94岁之间的事，属于过去的过去一直在做。用过去完成进行时。选D。