The film was made the World War II.A. base onB. based on C. to base onD. based in

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A. base on
(答案→)B. based on
C. to base on
D. based in
解析：句意：这部电影是根据第二次世界大战背景制作的。base…on…制作……以……为根据。the film 为base的逻辑宾语，所以用based表被动。选B。
考点: 考查非谓语形式做状语的用法。