语法与词汇 When they returned to the river, they found that the boat had _____ away.

【正确答案】 D

【答案解析】句意：他们回到河边的时候发现小船已经漂走了。float漂浮。frame设计；建造。frost结霜。frown皱眉。因此，本题的正确答案为D。