题干
. _______of the household rubbish _______recycled or reused since the new technology was applied.
A：Three-fourth; ha
B：Three-fourth; have bee
C：Three-fourths; has bee
D：Three-fourths; have
答案(点此获取答案解析）
C
上的函数
满足：
，且
时
，
，则
的值是( ▲ )