A Study of IBI311 in Subjects With Steroid-resistant, Thyroid Associated Ophthalmopathy

Placebo group: 10 mg/kg of placebo on Day 1, followed by 20 mg/kg, q3W of placebo for the following 3 infusions.10 mg/kg of IBI311 at Week 12, followed by 20 mg/kg, q3W of IBI311 for the remaining 3 infusions.

IBI311 group: 10 mg/kg of IBI311 on Day 1, followed by 20 mg/kg, q3W of IBI311 for the remaining 7 infusions; .