every thing can be expectedⁱⁿ ᵗ

Question

高中英语选择题
Has everything _____ can be done _____ done?
a./ , / b. / , been
c.that , been d.that , be
请说明原因

Answer 1

c
前面是定语从句,其中THAT为关系代词,EVERYTHING为先行词,在从句中做主语的成分,that绝对不可以省略(不要被被动的句型迷惑),故不能选AB,然后,把这句话转化为陈述句的表达方法Everything that can be done has _______ done
everything引导的成分做主语,has为助动词,故后填been