All that can be eaten eaten up.A. are beingB. has beenC. had beenD. have been

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A. are being
(答案→)B. has been
C. had been
D. have been
解析：选择B。本题题干中than can be eaten是定语从句，其所修是的先行词是all，那么就是说all 才是真正的主语，根据句意是说：所有能吃的都被吃光了。“食物”作主语，应当是单数谓语动词才是，所以选择B。