已知一个多项式与3x²+9x的和等于3x²+4x-1，则此多项式是（　　）

A．-6x²-5x-1

B．-5x-1

C．-6x²+5x+1

D．-5x+1

—Peter said that he would come over to have dinner with you tonight.

—But I think he              . I have been alone for an hour.

A．didn't

B．won't

C．hasn't

D．doesn't