【題目】—The air in Jinan used to be seriously polluted. But now it is really clean and fresh.

—Our government ________ much to improve it. Happiness is achieved through hard work.

A.doesB.didC.has doneD.will do

【答案】C

【解析】

句意：——濟(jì)南的空氣過去被嚴(yán)重污染。但現(xiàn)在它真的又干凈又新鮮。——我們的政府已經(jīng)做了很多改進(jìn)。幸福是通過努力工作獲得的。

A. does做，第三人稱單數(shù)；B. did做，過去式；C. has done已經(jīng)做了，現(xiàn)在完成時；D. will do將做，一般將來時。根據(jù)But now it is really clean and fresh.及下文Happiness is achieved through hard work.可知這里是用現(xiàn)在完成時態(tài)，其結(jié)構(gòu)是have /has done的形式。根據(jù)題意，故選C。

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