I can't understand why he so selfish. He isn't usually like that.A. wasB. had beenC. isD

问题补充：

I can understand why he so selfish. He isn usually like that.

A. was

B. had been

C. is

D. is being

答案：

A. was

B. had been

C. is

(答案→)D. is being

解析：D 考察动词时态。句义：我不理解他为什么这么自私，他通常不是这样的。进行时除了表示正在进行的动作之外，还可以表示将来时的概念，并且表示说话人的情感。在本句中表示情感。故D正确。