【題目】There are many tree heroes in China. They ______ millions of trees for almost 20 years.

A.plantB.plantedC.haveplantedD.areplanting

【答案】C

【解析】

句意：中國有許多樹英雄，在將近20年時間里他們已經(jīng)種了幾百萬棵樹。

考查現(xiàn)在完成時。plant一般現(xiàn)在時；planted一般過去時；haveplanted現(xiàn)在完成時；areplanting現(xiàn)在進行時。分析句子可知，此句中時間狀語是for almost 20 years，表示一段持續(xù)的時間，要用現(xiàn)在完成時，其構(gòu)成為have/ has done。故選C。

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