问题补充:
Onethird of the areacovered with green trees.About seventy percent of the trees
been planted.
A. are; have
B. is; has
C. is; have
D. are; has
答案:
A. are; have
B. is; has
(答案→)C. is; have
D. are; has
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。