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All __ is a continuous supply of fuel.

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All __ is a continuous supply of fuel.
A,what is needed B,the thing needed
C,that is needed D,for their needs
我选择了B,
不是说一句话不能有两个谓语动词吗?A.C不都是有is了吗?为什么还选择?
B,D为什么不对?
C,that is needed
选择C,ALL 是主句的主语,is a continuous supply of fuel.是主句的谓语部分.
that is needed 是定语从句修饰all,is 是从句里面主语that的谓语.
B 如果改成the thingS needed 也是对的
D的意思上不确切.
另外,修饰all 的定语从句不能用A.如果用A,全句就是:what is needed is a continuous supply of fuel.就不该有all了.那么what is needed就是主语从句,做is a continuous supply of fuel 的主语.