________ snacks and drinks, but they also brought cards for entertainment when they had a picnic in the forest．
A.Not only they broughtB.Not only did they bringC.Not only brought theyD.Not only they did bring在线课程B
解析：
考查倒装句。not only…but also连接两个并列分句，not only放在句首，第一个分句倒装，并且时态保持一致。