could you tell me what to do it可以吗?那个it要不要加,

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could you tell me what to do it可以吗?那个it要不要加,
could you tell me what to do it可以吗?那个it要不要加,

could you tell me what to do it可以吗?那个it要不要加,
不加it!
疑问代词what在这里作do的宾语,加it,宾语就重复了.
但是可以写成:Could you tell me how to do it.此时加it,因为how是疑问副词,不能作宾语,只能补加一个宾语.