直线y＝a与函数y＝x³－3x的图象有三个相异的交点，则a的取值范围为 (　　)．

A．(－2,2)

B．[－2,2]

C．[2，＋∞)

D．(－∞，－2]

—I failed again. I wish I _________ harder.

—But you _________.

A．had worked; hadn’t

B．worked; don’t

C．had worked; didn’t 　

D．worked; didn’t