You had better ___(hand)in your exam paper as soon as you finish it.

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• You had better ___(hand)in your exam paper as soon as you finish it.
• Did you finish your homework?Yes.Thanks- to -your dictinary,I had a better understanding of it.
• You had better ___(hand)in your exam paper as soon as you finish it.
• Did you finish your homework?Yes.Thanks- to -your dictinary,I had a better understanding of it.为什么那里要用to而不是for?为什么后面的better前要加一个the?
• he said to me:"you had better hand in your paper at once."怎样变成间接引语?
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