Sir do you have anything this afternoon? If there is nothing to do I wonder if I can as

问题补充：

Sir, do you have anything this afternoon? If there is nothing to do, I wonder if I can ask for a leave．

A. typing

B. typed

C. to type

D. to be typed

答案：

A. typing

B. typed

C. to type

(答案→)D. to be typed

解析：

这里考查不定式做定语修饰不定代词anything的用法，因为type这个动作不是句子主语you去做，所以用不定式被动式，如果动作是句子主语做，就用have sth to do，如：I have some homework to do.