They will wait at the entrance to welcome their parents(划线部分to welcome their parents)

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They will wait at the entrance to welcome their parents(划线部分to welcome their parents)

What will they wait to do at the entrance?
句意:他们将要在入口处等待做什么事?
用what对不定式to do提问.

Why will they wait at the entrance?
(划线部分是解释为什么他们要在出口处等着,也就是他们的目的,所以要用why来提问)

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