__happiness is built on the basis of health.
__happiness is built on the basis of health.
a.ninth-tenth b.nine-tenth c.nine-tenths d.nine-ten 选什么 为什么啊
可是有的题表分数却看到连字符 还后面加s 如we could hardly see any trees here ten years ago,but now____of this area is covered by trees.答案却是two-thirds 为什么啊