—I didn’t take notes at yesterday’s meeting because I had left my pen at home.—You mine.

问题补充：

—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; wasn’t using

C. should have borrowed; hadn’t used

D. could have borrowed; wasn’t using

答案：

A. must have borrowed; wasn’t using

B. may have borrowed; wasn’t using

C. should have borrowed; hadn’t used

(答案→)D. could have borrowed; wasn’t using

解析：考查情态动词+完成时，must have done 表示对过去的事情肯定推测；may have done 表示对过去事情不肯定推测；should have done表示应该做某事而没做； could have done表示过去未完成的事情，根据句子意思，所以选D