you should answer the paper in-------,not with------ Apen pencil B a pen a pencil Cpen a pencil
问题描述：
you should answer the paper in-------,not with------ Apen pencil B a pen a pencil Cpen a pencil
答
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.