I ______(not be) to an park before.

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I ______(not be) to an park before.
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I ______(not be) to an park before.
I ______(not be) to an park before.

I ______(not be) to an park before.
I __haven't been____(not be) to an park before.
before 要用现在完成时

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I haven't been to an park before.