Question

One-third of the area ________ covered with trees. About seventy percent of the trees _______ been planted recently.

1. A.
   is; has
2. B.
   is; have
3. C.
   are; have
4. D.
   are; has

Answer 1

B
试题分析：考查主谓一致：当主语被分数或百分数修饰时，谓语和后面的名词一致，第一空One-third of +单数名词+单数谓语，第二空seventy percent of +复数名词+复数谓语，句意：三分之一的地区被绿树覆盖。已经种植了大约百分之七十的树木。选B。
考点：考查主谓一致
点评：主谓一致的考点较多，要在理解的基础上加以记忆，多练习加以巩固。这里考查的是如果当主语被分数或百分数修饰时，谓语和分数或百分数后面的名词一致。