1.答案是C.比较两个句子：I have some letters to write.我有几封信要写.to write 本人写,即主语写.
I have some letters to be written.我有几封信要写（对秘书说话呢）,to be written 别人写.在句子Do you have anything to be taken to your son?中,主语是You,而你是不去北京的,因此,选to be taken,让别人做.
2.Mr.Jackson,do you have somethsing to be typed?
3.I have something to wash.我自己洗.
I have something to be washed.别人洗.
I will have my clothes washed.可能是自己洗,也可能是别人洗.完全看上下文.如：I will have my hair cut.那肯定是别人帮我剪了.这个句型强调的是某件事需要做,并不强调谁做.