The ______ physicist has been challenged by his colleagues.

The ______ physicist has been challenged by his colleagues.
A、respecting
B、respectful
C、respective
D、respected
【正确答案】：D
【题目解析】：题干译文：这位令人尊敬的物理学家受到了同事的挑战。本题考查词语的辨析。respectful是形容词，意为恭敬的，尊重人的，有礼貌的；respective是形容词，表示分别的，各自的respecting是介词,意为关系，说到；respected是形容词,意为受人尊敬的，令人尊敬的。答案为D。