问题补充：
I believe that those mountains with trees in a few years’ time.
A. are covered
B. will be covered
C. are covering
D. will cover
答案：
A. are covered
(答案→)B. will be covered
C. are covering
D. will cover
解析：考查时态。根据时间 in a few years’ time，表示的是将来，所以应用将来时态，根据语境those mountains 应该是被树覆盖，所以用被动语态。故选B。
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