14.My mother ______ herself busy since she retired from work.( 。
A.keepsB.has keptC.had keptD.would keep

分析 自從媽媽退休以來,她一直忙著.

解答 答案:B 現(xiàn)在完成時(shí)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(dòng)作或狀態(tài),常與since或for引導(dǎo)的時(shí)間狀語連用.根據(jù)since she retired from work.可知自從媽媽退休以來就一直忙著,并有可能會(huì)持續(xù)下去,應(yīng)該用現(xiàn)在完成時(shí)態(tài).現(xiàn)在完成時(shí)態(tài)的構(gòu)成:助動(dòng)詞have/has+過去分詞,根據(jù)主語My mother,是第三人單數(shù),所以應(yīng)該用has,故選:B.

點(diǎn)評(píng) 本題主要考查動(dòng)詞時(shí)態(tài),做此類題目要注意時(shí)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(shí)更應(yīng)記清時(shí)態(tài)的構(gòu)成形式.就本題而言,主要考查現(xiàn)在完成時(shí)態(tài).

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