题目内容
9. You won't make much progress in your lessons if you don't work hard at them. (改为同义句)
You make much progress in your lessons you work hard at them.
9. won't;unless
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题目内容
9. You won't make much progress in your lessons if you don't work hard at them. (改为同义句)
You make much progress in your lessons you work hard at them.
9. won't;unless