GMAT Sentence Correction
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Source: OG
Level: 3
To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.
- A have to know a great deal more than now about the social and economic
- B have to know a great deal more than they do now about the social and economical
- C would have to know a great deal more than they do now about the social and economical
- D would have to know a great deal more than they do now about the social and economic
- E would have to know a great deal more than now about the social and economical