Mr. White is a careful and experienced engineer so he is often to finish some challenging

问题补充：

Mr. White is a careful and experienced engineer, so he is often to finish some challenging tasks.

A. appreciated

B. approached

C. appointed

D. agreed

答案：

A. appreciated

B. approached

(答案→)C. appointed

D. agreed

解析：考查动词辨析：A. appreciated欣赏，B. approached靠近，C. appointed任命，委派，D. agreed同意，句意：怀特先生是仔细的有经验的工程师，所以他经常被派去完成有挑战性的任务。选C。