| A. | did | B. | were doing | C. | will do | D. | have done |
分析 自从地球日被创立以来,人们已经做了越来越多有益的事情来保护地球.
解答 答案:D 现在完成时基本用法之一:表示过去已经开始,持续到现在,而且还可能继续下去的动作或状态,常与since或for引导的时间状语连用.结合句意,根据since Earth Day was started.可知应该用现在完成时态.现在完成时态的构成:助动词have/has+过去分词,根据主语People是复数,所以应该用have done,故选:D.
点评 本题主要考查动词时态,做此类题目一定注意时间状语、标志词.根据上下文所表达的含义,做出判断.同时更应记清时态的构成形式.就本题而言,主要考查现在完成时态.
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