Question

All that can be eaten _______ eaten up.

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

Answer 1

B

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。