Allthatcanbeeateneatenup.A.hasbeen.BAllthatcanbeeateneatenup.A.hasbeen.Bhavebeen.为啥是A,All不是要用复数的吗?

Question

All that can be eaten _____ eaten up.A.has been.B
All that can be eaten _____ eaten up.
A.has been.B have been.
为啥是A,All不是要用复数的吗?

Answer 1

All that can be eaten _____ eaten up.
A.has been.B have been.
选A.
all 单独用作主语时,其谓语的数要根据其具体含义来确定.如：
All is silent.万籁俱寂 (指现象).
All are silent.人人都沉默不语 (指具体的人).
All that can be eaten has been eaten up中的all指【所有能吃的东西】属【物质/食物food】是【不可数名词】,谓语动词用单数形式.