complete the map of each site based on what you hear on the tape.为什么中间是based on,不是be based on?
问题描述：
complete the map of each site based on what you hear on the tape.
为什么中间是based on,不是be based on?
答
注意谓语的个数,这里是祈使句已经存在 谓语.怎么会再有一个be.如果变成be based on 的话 后面的部分没法解释了.