Question

改句子I must admit that means my long-term efforts are successf

Answer 1

I must admit that it means that my long-term efforts are likely to be successful.

分析：

I must admit（主句） that（宾语从句连接词）

it（从句部分的主语） means（谓语）

that （宾语从句连接词,） my long-term efforts are likely to be successful（宾语）