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Select the most appropriate option to fill in the blank.My grandfather will come here ___ a week.

Question

Select the most appropriate option to fill in the blank.
My grandfather will come here ___ a week.

before

Solution

The sentence requires a preposition indicating the time frame for the grandfather’s arrival.
Within is appropriate, meaning “My grandfather will come here within a week”, implying any time up to a week from now.
Before suggests prior to a specific point, not a duration. At is used for precise times, and with is irrelevant.
Within a week is a common phrase for an event expected soon, fitting the context.
The sentence reads naturally and grammatically correctly with within.
Thus, within is the correct answer.