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。
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