单选题The _______ physicist has been challenged by many people in his field.A respectedB respectful C respectiveD respect

单选题

The _______ physicist has been challenged by many people in his field.

respected

respectful

respective

respect

正确答案： D

解析：
这位受人尊敬的物理学家曾受到业内许多人的挑战。respected受人尊敬的。respectful尊敬的，有礼貌的。respective分别的，各自的。respect尊敬。

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