2. 公务员
  3. One-third of the area______covered with green trees. About seventy percent of the trees______been planted.

One-third of the area______covered with green trees. About seventy percent of the trees______been planted.

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问题 One-third of the area______covered with green trees. About seventy percent of the trees______been planted.
选项 A、are: have
B、is: has
C、is: have
D、are: has
答案C
解析 “分数或百分数+of the+名词或代词”作主语时，谓语动词的单、复数形式取决于名词或代词的单、复数形式。故选C。
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