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I can't understand why he ________ so selfish. He isn't usually like that.
A.wasB.had been
C.isD.is being
D
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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