摘要: Historically, main material for making tables has been wood, but metal and stone have also been used. A the;the B. the;不填 C. 不填; the D. 不填;不填 答案:B 指导:第一空是特指“某种材料 ,第二空后的metal和stone都是物质名词.即不可数名词.表泛指.不加任何冠词.

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