She looks sad.Could you tell me ____that prevents her from being as happy as before? A.what it is is what

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She looks sad.Could you tell me ____that prevents her from being as happy as before? A.what it is is what宾语从句中含特殊强调句,强调what,正常词序是it is what that prevents her from being as happy as before,what 作为引导词要放在前边;

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A 宾语从句!