A. | did | B. | were doing | C. | will do | D. | have done |
分析 自從地球日被創(chuàng)立以來,人們已經(jīng)做了越來越多有益的事情來保護地球.
解答 答案:D 現(xiàn)在完成時基本用法之一:表示過去已經(jīng)開始,持續(xù)到現(xiàn)在,而且還可能繼續(xù)下去的動作或狀態(tài),常與since或for引導(dǎo)的時間狀語連用.結(jié)合句意,根據(jù)since Earth Day was started.可知應(yīng)該用現(xiàn)在完成時態(tài).現(xiàn)在完成時態(tài)的構(gòu)成:助動詞have/has+過去分詞,根據(jù)主語People是復(fù)數(shù),所以應(yīng)該用have done,故選:D.
點評 本題主要考查動詞時態(tài),做此類題目一定注意時間狀語、標(biāo)志詞.根據(jù)上下文所表達(dá)的含義,做出判斷.同時更應(yīng)記清時態(tài)的構(gòu)成形式.就本題而言,主要考查現(xiàn)在完成時態(tài).
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