we were excited to learn that the last month is sales ( )by 30%.
问题描述：
we were excited to learn that the last month is sales ( )by 30%.
A.had increased B.increase C.are increasing D.have increased
答
你这道题应该是last month后面是's吧,貌似不是is,因为那样翻译不通!
had increased过去完成时：已经增长了...我们听到上个月的销售增长了百分之三十时我们都很激动.