he had only practiced the part a few times; he did it successfully beyond expectation.A. U

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A. Unless
B. If
C. Because
(答案→)D. Although
解析：句意：这角色虽然他只排练了几次，但是他出人意料地演得非常成功。根据句子的逻辑关系可知用Although，A. Unless除非，B. If如果，C. Because因为，应选择D项。