This is the only one of the ancient customers that ( )down in this area up to now.
答案给的是has been passed.我不明白为什么that修饰的是the only one.是不是of的原因呢.
另外还有一道题：In the south of China large amounts of bamboo (_)paper as well as farming tools .
答案是are used to make.一类题的吧.是不是因为of呢?