So badly ________in the car accident that he had to stay in the hospital for treatment.
句意: 彼得在车祸中受伤太严重了以至于他要住院接受治疗。 正常语序为 Peter was badly injured, 当以so+形容词/副词开头进行强调时主谓应作倒装, 将 be 动词提到主语之前。