prep破解版2-8

小雪猫 · 发表于 2007-7-2 04:48:00

8. (24773-!-item-!-188;#058&001691)

Ozone, a special form of oxygen that screens out harmful ultraviolet rays, 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

为什么选d？？不应该是一般现在时吗？long appeared immune to这是什么意思？

小雪猫 · 发表于 2007-7-2 06:37:00

carolinelmf · 发表于 2007-7-4 00:01:00

时态上也不太明，但appear这里作系动词，相当于be，貌似对...免疫

小雪猫 · 发表于 2007-7-9 02:50:00

seastone · 发表于 2007-7-9 03:40:00

后面的we have now realized, though, that emissions of industrial chlorofluorocarbons deplete the ozone layer.,这个句子给出了时间的参考点, 所以我们需要用:HAD LONG APPEARED IMMUNE TO

20060612cat · 发表于 2007-7-15 00:36:00

过去完成时应该是过去的过去, 这里后半句用的是现在完成,不是过去时. 不懂为什么要用had long appeared?

prep破解版2-8

prep破解版2-8

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