33. Historians believe that some forms of an advertising must be as old as barter and trade.
Key:C
分析: 动名词advertising前不能加不定冠词an,应该去掉。
改正:an advertising→advertising
参考译文:历史学家们相信某些形式的广告很可能和物品交换以及贸易一样古老。
我的问题:advertising应该是复数形式把?an advertising→advertisings
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