可导致血小板减少的疾病有（）

A.急性粒细胞白血病

B.原发性血小板减少性紫癜

C.再生障碍性贫血

D.真性红细胞增多症

E.过敏性紫癜

—  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