He is very plite.he often say 'thanks"----otherA.withB.toC.forD.of

问题描述:

He is very plite.he often say 'thanks"----otherA.withB.toC.forD.of

to
句意:他非常有礼貌,经常对别人说“谢谢”.
say sth.to sb.向某人说某事
所以用to