— I haven't finished my essay because the computer broke down when I was downloading the

required data last night.

— Really! You could have turned to me. I         mine. [      ]

A. didn't use

B. won't use

C. hadn't used

D. wasn't using

收藏品中，价值一般较高，投资者要具有相当的经济实力是指（）。

A.古玩

B.艺术品

C.邮票

D.纪念币