想请教你，What would you do?中的would如果表示意愿，同样的will也可以表示意愿，这里为什么不用will？

If I won the pools, I’d go round the world.
Wouldn’t you? I wouldn’t.
What would you do?
Oh, I don’t know. I’d buy a big house with a garden for my wife and kids, I suppose. But it’s difficult to imagine havinga lot of money.

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