"I have some letters ____."the boss said to the secretary.

题目

"I have some letters ____."the boss said to the secretary.
A.to be typed
B.typed
不是have sth.done让某是被别人做吗?这里为什么选A？

答案

首先是被动语态,其次是“要被打印”,还未打印,所以要用to