关于CDFI，以下不对的是（）。

A.能显示血流方向

B.能显示血流速度的快慢

C.能显示血流的性质和种类

D.成像不受超声入射角的影响

E.当超过尼奎斯特极限时可出现彩色反转

—Peter didn’t come to the meeting this morning.

— I _______ him yesterday, but I was too busy and forgot it.

A．should have told

B．should tell

C．had to tell

D．had told