you should answer the paper in-------,not with------ Apen pencil B a pen a pencil Cpen a pencil

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you should answer the paper in-------,not with------ Apen pencil B a pen a pencil Cpen a pencil

选C.记住in pen / pencil; with a pen / pencil,in ink
用in不加冠词,不用复数; 用with要加冠词,可用复数.ink是个不可数名词,不加冠词.