49． Reporting that one of its many problems had been the recent extended sales slump in women's apparel，the seven-store retailer said it would start a three-month liquidation sale in all of its stores．
(A) its many problems had been the recent
(B) its many problems has been the recently
(C) its many problems is the recently
(D) their many problems is the recent
(E) their many problems had been the recent
这题选A, 对答案及选项本身都没有问题. 但是OG在对于B项的解释中说:
Has been indicates ongoing，not completed，action.
这句话我不明白, has been the...sales slump分明是一个现在完全时, 为什么说它是一个ongoing的动作呢?
现在完成时，过去一直重复到现在的动作，过去发生会对现在产生影响
好难啊~~~,要分析句子的含义才行
不过主句过去时,从句用过去完成时,这样可以直接选出答案
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