All that can be eaten eaten up. A. are being B. has been C. had been D. have bee

All that can be eaten _______ eaten up.

A. are being B. has been C. had been D. have been

试题答案

B

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。