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问题: Help me please

In the margins ______ written something in red ink.
A. are B. were C. was D. have
The key of it is C, could you please explain the reason to me?

解答:

[1]你看见时,那字在过去写下了.过去时态.
[2]something:某种内容,抽象概念,用单数.
如:Something has gone wrong with the machine.
[3]被动语态. in red ink用红墨水[写的]