On the notes proved to be forgeries.
A.inspect B.inspection C.inspector D.inspecting
On the notes proved to be forgeries.
A.inspect B.inspection C.inspector D.inspecting
B
介词on可以表示“在……的时候,一……就”,其后跟名词、代词或动名词来作介词宾语,故排除A项,根据句意排除C选项,inspect是一个及物动词,若选D项则缺少动词宾语,故答案选B。