To tell you the truth, I think it is you______ Mr. Black______.

A．less than, which are to be blamed

B．rather than, that are to blame

C．other than, that is to blame

D．more than, who is to blame

假定其他因素既定不变，自发投资增加时，IS曲线将（）。

A.平行向右移动

B.平行向左移动

C.变得更加陡峭

D.变得更加平坦