Most Americans would prefer to keep their problems__themselves,and solve their problems__themselves.

题目

Most Americans would prefer to keep their problems__themselves,and solve their problems__themselves.
A to .by B by to C for to D in on
求详解,谢蛤~

答案

a
大多数美国人更倾向于把问题放在心里并靠自己来解决.
keep to有待在；（使）遵守（秘密等）；保密；（使）谈话不离题等意思
by oneself是靠某人自己的意思