in the old days people used bamboo to _before paper_.A.write;was invented B.write on;was invited
问题描述：
in the old days people used bamboo to _before paper_.A.write;was invented B.write on;was invited
为什么用write on
答
很显然的道理：paper和bamboo都是用来在上面写字的,而不是用来写字的（用来写字的是笔）,所以是write on.