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】：
受人尊敬的物理学家受到同事的挑战。respecting是respect的现在分词形式，表示尊敬；respectful表示尊重的；respective表示各自的；只有respected受人尊敬的符合题意，所以选D。
The（）physicist has been challenged by his colleagues.
The（）physicist has been challenged by his colleagues.
respecting
respectful
respective
respected
受人尊敬的物理学家受到同事的挑战。respecting是respect的现在分词形式，表示尊敬；respectful表示尊重的；respective表示各自的；只有respected受人尊敬的符合题意，所以选D。