Please someone help me!

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May 21st 2012 00:17
Please someone help me! Which sentence is correct? I am so confused. I believe not only me but also for all Japanese. It is very difficult to understand the difference these sentences.
Your speaking ability doesn't necessarily improve just because your TOEIC score rises.
Your speaking ability didn’t necessarily improved just because your TOEIC score rose.
Your speaking ability doesn’t necessarily have been improved just because your TOEIC score had been risen.