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25. Ozone reaches high concentrations twelve miles above Earth, where it has long appeared that it was immune from human influence; we have now realized, though, that emissions of industrial chlorofluorocarbons deplete the ozone layer. A) has long appeared that it was immune from B) has long appeared to have been immune from C) has long appeared as being immune to D) had long appeared immune to E) had long appeared that it was immune to 答案是D，似乎是最好的答案鸟。。。但想请教主语用的明明是一般过去时，为什么从句可以用过去完成时呢？ 另外immune from和immune to有什么区别，怎么选择呢？谢谢！ 39. Taste buds are onion-shaped structures with between 50 and 100 taste cells, each of them has fingerlike projections poking through the opening located at the top of the taste bud called the taste pore. A. them has fingerlike projections poking through the opening located at the top of the taste bud called the taste pore B. them that have fingerlike projections that poke through an opening located at the top of the taste bud, which they call the taste pore C. which has fingerlike projections poking through the opening, called the taste pore, located at the top of taste bud D. which having fingerlike projections that poke through an opening, which is called the taste pore, located at the top of the taste bud E. which have fingerlike projections that are poking through an opening located at the top of the taste bud called the taste pore 答案是C，想请教为什么called和located之间可以不用连词呢？谢谢咯~~ | 
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发表于 2006-12-11 17:53:00
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