1000 Real GMAT Sentence Correction Questions 1. 1 A “calendar stick” carved centuries ago by the Winnebago tribe may provide the first evidence that the North American Indians have developed advanced full-year calendars basing them on systematic astronomical observation. (A) that the North American Indians have developed advanced full-year calendars basing them (B) of the North American Indians who have developed advanced full-year calendars and based them (C) of the development of advanced
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