I believe that those mountains ________ trees in a few years’ time.A.are covered withB.will be covered withC.are covering byD.will cover by
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B解析in a few years’time是表示将来的时间状语，in意指“在……以后”，故句中谓语需用将来时态。宾语从句中的主语those mountains是动作的承受者，它不能发出cover这一动作，可见宾语从句中的谓语动词需用一般将来时的被动语态，且cover后面常与介词with连用。