【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(guó)有許多樹(shù)英雄，在將近20年時(shí)間里他們已經(jīng)種了幾百萬(wàn)棵樹(shù)。

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

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