—  I didn't take notes at yesterday's meeting because I had left my pen at

     home.                                         

—  You ____ mine. I ___ it.                                          

A. must have borrowed , wasn't using      

B. may have borrowed , didn't use                      

C. could have borrowed , wasn't using    

D. should have borrowed , hadn't used

现代供应链管理强调赢利性管理，它是建立在（）基础上的。

A.竞争

B.双赢

C.垄断

D.垄断竞争