【題目】Our capital, Beijing, ______ on improving the city’s environment in the past three years through various measures.

A. has been workingB. were working

C. workedD. had worked

【答案】A

【解析】

考查動詞時態(tài)。句意：在過去的三年里，我們的首都北京通過各種措施致力于改善城市環(huán)境。由下文“in the past three years”可知，在過去的三年里北京一直致力于改善環(huán)境，動作具有延續(xù)性，所以應該用現(xiàn)在完成進行時。故選A。

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