Question

I believe that those mountains ________ trees in a few years’ time.

A. are covered with
B. will be covered with
C. are covering by
D. will cover by

Answer 1

答案B
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。