GMAT Sentence Correction
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Source: PREP
Level: 3
When Nigeria achieved full independence in 1960, they had already established a federal political structure consisting of three regions based on the three major population clusters that were in its borders.
- A they had already established a federal political structure consisting of three regions based on the three major population clusters that were in
- B they already had established a federal political structure consisting of three regions that was based on the three major population clusters inside
- C they already had established a federal political structure that consisted of three regions based on the three major population clusters in
- D it had already established a federal political structure that consisted of three regions based on the three major population clusters within
- E it already had established a federal political structure consisting of three regions being based on the three major population clusters it had within