Unlike the automobile company, whose research was based on crashes involving sport utility vehicles, the research conducted by the insurance company took into account such factors as a driver’s age, sex, and previous driving record.
company, whose research was based on
company, which researched
company, in its research of
company’s research, having been based on
company’s research on
d选项的having been based on is wordy, 并且it is unclear whether it modifies research conducted by the automobile company or the research conducted by the insurance company.
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