Mr. Wang, have you corrected the papers? — Yes, but I regretthat you didn’t pass it. [ ]

________ his help, I finally caught up with my classmates

下列各句中，没有语病的一句是（ ）

This is _________ story I’ve told you about several times.–It’s great .I’ve never heard _______ more exciting one.

Tom very hard to learn maths, but he was still not good at it.