题干
Peter is busy ___________ at school, but he never forgets __________ exercise every day.
A：work, doing
B：working, to do
C：work, to do
D：working, doing
答案(点此获取答案解析）
B
、-0.95、
、0、
、0.121121112…、
、
、
无理数的个数为（ ）