并列句与并列连词用法 — 英语词汇题
题目
用并列连词 and, but, or, so 填空：1. The doctor worked day and night, ___ she never complained. 2. Take the medicine on time, ___ the illness may get worse. 3. He was exhausted, ___ he kept on treating the patients. 4. Doctors and volunteers came together, ___ they broke the boundaries between nations.