Knowledgeable as he is the expert was unwilling to offer advice to he thought was not qu

问题补充：

Knowledgeable as he is, the expert was unwilling to offer advice to he thought was not qualified.

A. whoever

B. who

C. whom

D. which

答案：

(答案→)A. whoever

B. who

C. whom

D. which

解析：通过分析句子结构，可知这个句子中包含一个宾语从句。这个宾语从句作介词的宾语，引导词在宾语从句中作宾语，且表示“任何人”的意思，故用whoever。