摘要：90] Historically, main material for making tables has been wood, but metal and stone have also been used. [译文] 历史地说.做桌子的的原料一直是木料.但是金属和石料也可以用了. A. the; / B. /; / C. the; the D. /; the [答案及简析] A. 第一个为特指;第二个空不填是因为meta, stone不可数名词表示种类.

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