GRE Text Completion: ETS Official Practice 150-GRE OP150:填空 - B5W765Z75HDG0DYNO

In his unexpurgated autobiography, Mark Twain commented freely on the flaws and foibles of his country, making some observations so ____________ that his heirs and editors feared they would damage Twain's reputation if not withheld. A. buoyant B. acerbic C. premonitory D. laudatory E. temperate