Question

【题目】There were many old walls here twenty years ago, but now few of them (剩下).

Answer 1

【答案】remain
【解析】句意：二十年前这里有很多老城墙，但现在很少有剩下的了。remain剩下；仍然是。由now可知此处用现在时态，主语few of them是复数形式，所以答案是remain。