Before closing the door to his office, he told his secretary that he was ________.A. to not disturb B. not to disturb C. to not be disturbed D, not to be disturbed
I’m Tom. I’m an American boy. Jim is my friend. He’s from England. He’s thirteen. We are at the same age. My sister is Ann. She is ten. We are in the same school. But we are in different gra
和
，定义运算“
”：
，设函数
，若函数
的图象与
轴恰有两个公共点，则实数
的取值范围是（ ）
B. 
C. 
D. 
