A scientific report has found that snow and ice on Africa’s highest mountain Kilimanjaro ______rapidly and could vanish within 20 years.   
A.has been meltedB.will melt
C.is meltingD.was being melted
C

試題分析:句意:一份科學(xué)報告表明:非洲最高的山脈乞力馬扎羅山上的積雪和冰層正在快速融化,并可能在未來20年內(nèi)徹底消失。表示現(xiàn)在正在進(jìn)行的動作,故用現(xiàn)在進(jìn)行時。
點(diǎn)評:這種用法往往表示發(fā)生在過去,說話時沒完成,仍在繼續(xù)進(jìn)行的動作或狀態(tài)。做題時可以從上下文推斷應(yīng)選用的時態(tài)。主句用了現(xiàn)在完成時,從句中不會用過去進(jìn)行時,從句中后半句中用了將來時,那么前半句就應(yīng)該比將來時早一步,即“現(xiàn)在”,選項中A是現(xiàn)在完成時,C是現(xiàn)在進(jìn)行時,根據(jù)主語和動詞的關(guān)系可以排除A。
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