一Tell us, Mark ,what is the ____ of the American Civil War?
一 Well, is it because the black slaves wanted freedom?

一Tell us, Mark ,what is the ____ of the American Civil War?

一Well, is it because the black slaves wanted freedom?

1. A.
   effect
2. B.
   cause
3. C.
   result
4. D.
   reason

一Tell us, Mark ,what is the ____ of the American Civil War?

一 Well, is it because the black slaves wanted freedom?

A. effect            B. cause           C. result               D. reason