请问这道题应该如何判断,选择?All the kids are crying now.What _____ makes them so unhappy?  A.it is B.is it C.it is that D.is it that

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请问这道题应该如何判断,选择?All the kids are crying now.What _____ makes them so unhappy?  A.it is B.is it C.it is that D.is it that

请问这道题应该如何判断,选择?All the kids are crying now.What _____ makes them so unhappy?  A.it is B.is it C.it is that D.is it that
请问这道题应该如何判断,选择?
All the kids are crying now.What _____ makes them so unhappy?
  A.it is B.is it C.it is that D.is it that

请问这道题应该如何判断,选择?All the kids are crying now.What _____ makes them so unhappy?  A.it is B.is it C.it is that D.is it that
D 强调句型的特殊疑问句.

D 这是定语从句,that 后的部分用来修饰it。