题干
---Have you found your book yet?
--- No, I’m not sure where I________it?
A：leave
B：had left
C：could have left
D：was to leave.
答案(点此获取答案解析）
C
A：leave
B：had left
C：could have left
D：was to leave.
的图象如图所示，则
等于( ) 