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

网友回答

A. are being
(答案→)B. has been
C. had been
D. have been
解析：本句话中，主句的主语是all,为抽象概念。因此，其谓语应用单数的has been。关系代词that引导定语从句，并在从句中作主语。