Retailers reported moderate gains in their November sales, as much because of their sales of a year earlier being so bad as that shoppers were getting a head start on buying their holiday gifts.
Retailers reported moderate gains in their November sales, as much because of their sales of a year earlier being so bad as that shoppers were getting a head start on buying their holiday gifts. (A) of their sales of a year earlier being so bad as that (B) of their sales a year earlier having been as bad as because (C) of their sales a year earlier being as bad as because (D) their sales a year earlier had been so bad as because (E) their sales of a year earlier were as bad as that 答案是D,我觉得逻辑上没有问题,就是D选项的时态我有点不明白,为什么要用过去完成时,而不是对应的过去时~谢谢~