easy · GMAT Verbal

Every shelf in the back room has been dusted this week. The top shelf is in the back room.

Which statement must be true on the basis of these sentences?

  1. The top shelf was dusted before any other shelf.
  2. Every shelf in the entire store has been dusted this week.
  3. The back room is used for extra storage.
  4. The top shelf has been dusted this week.
  5. The top shelf has not been dusted this week.

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