- I didn't take notes at yesterday's meeting because I had left my pen at home.

—  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

试题答案

C