Question

Claire: As you all know, almost everything can be delivered in Seoul, and I love that! Even hamburgers can be delivered here.

Fangjin: And the speed of delivery is unbelievable. Last night, I ordered fried chicken, and it was delivered in less than 30 minutes. So quick!
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In the last sentence, what is the full form of 'So quick'? (tense...etc)

1. It was so quick!
2. It is so quick!
3. The delivery was/is so quick!
4. The speed was/is so quick!
Writeacher
All four of the answers work, but #3 is the best.

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