— 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

现代标准化的主要特点是：系统性、（）以及目标和手段的现代化。

A.多样性

B.先进性

C.国际性

D.综合性。