If it rains, the picnic will be postponed ______ a day.

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Multiple Choice

If it rains, the picnic will be postponed ______ a day.

Explanation:
When we talk about delaying something, using by to show the amount of delay is natural. “Postponed by a day” means the event is moved one day later than planned. So the picnic will take place one day later if it rains. Other prepositions don’t fit this meaning: “until a day” isn’t a natural way to express a specific delay, “to a day” isn’t idiomatic for this context, and while “for a day” could refer to duration, it doesn’t convey the exact shift in date as clearly as “by a day.”

When we talk about delaying something, using by to show the amount of delay is natural. “Postponed by a day” means the event is moved one day later than planned. So the picnic will take place one day later if it rains. Other prepositions don’t fit this meaning: “until a day” isn’t a natural way to express a specific delay, “to a day” isn’t idiomatic for this context, and while “for a day” could refer to duration, it doesn’t convey the exact shift in date as clearly as “by a day.”

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