MiaZhang 发表于 2012-11-17 15:29
LS这道题,我觉得是考察了句子表达的简洁性。B选项,Nearly 99 percent of five hundred million different ...
yiqing2012 发表于 2012-11-17 18:26
同意楼上,补充一点:B中appeared表示过去,可以还是有生物还在存在,所以have appeared更好。。。ps:感觉 ...
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