"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?

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"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?
"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?

"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?
首先是被动语态,其次是“要被打印”,还未打印,所以要用to