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We shall finish the work __________ a week.

  • A.on
  • B.within
  • C.after
  • D.in

Answer: B

The preposition is within: We shall finish the work within a week.

Within means "before the end of" a period: the work will be completed at some time during the coming week, no later.

In a week usually means "after a week from now" or "taking a week", not "before a week is over", and after a week sets the finish later still. On is used with days and dates, not with a length of time.

So within a week answers "by when?" (any time up to seven days), while in a week answers "how soon?" or "how long?", which is why it is the near miss.

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