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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 考察動詞時態(tài)。句義：我不理解他為什么這么自私，他通常不是這樣的。進行時除了表示正在進行的動作之外，還可以表示將來時的概念，并且表示說話人的情感。在本句中表示情感。故D正確。
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