The commutation of a criminal's sentence differs from a pardon ____________

　　 reduces the terms of punishment rather excuses the criminal completely.

　　 (A) in that

　　 (B) that it in

　　 (C) in that it

　　 (D) that in

　　 哪一个是正确的?为什么？

　　 Thanks

　　我觉得是C

　　首先BD是肯定不对的(看看后面的reduces就知道不能用介词in接reduces)A同样道理，若选A，则从句缺少主语。其实，若从意思上看，直接选C就行，也不用排除法了。