The film on the book by Jack London is well worth.A. basing; seeingB. based; being seenC.

问题补充：

The film on the book by Jack London is well worth.

A. basing; seeing

B. based; being seen

C. to be based; to see

D. based; seeing

答案：

A. basing; seeing

B. based; being seen

C. to be based; to see

(答案→)D. based; seeing

解析：第一个空，主语film与动词base之间是被动关系，故用过去分词作定语；第二个空，worth是形容词，“价值，值得……”，后接名词或动名词，故选D。