问一道SC

芬琳思UID: 2185176

even though is per capital food supply hardly increased during two decades, stringent rationing and planned distribution have allowed the People's Republic of China to ensure nutritional levels of 2000 ca;ories per person per day for its population.

A:even though its per capital food supply hardly increased during

B:even though its per capital food supply has hardly increased in

CDE答案就不写了．严重错误的

正确答案是Ｂ

可是我觉得这个句子用过去时更好，而且把during 取掉．因为increase 在这里似乎应该说明的是结果，而不是过程．

大家帮忙分析下

ripplewanUID: 155033

但是好像说如果有时间段的话一般选择完成时态。