With the world changing fast we have something new with all by ourselves every day.A. dea

问题补充：

With the world changing fast, we have something new with all by ourselves every day.

A. deal

B. dealt

C. to deal

D. dealing

答案：

A. deal

B. dealt

(答案→)C. to deal

D. dealing

解析：考查非谓语动词。此处句意为我们有一些要去解决的新事情-----，可知不定式作定语表未做。选C符合。