题干
He is said _______ a new machine recently, but I don’t know when he will make it.
A：to desig
B：to be designed
C：to have designed
D：to have been designing
答案(点此获取答案解析）
D
的最小正周期为
，若其图象向左平移
个单位后得到的函数为奇函数，则函数
的图象 （ ）