问题描述：
1.The thought of going back home was ___ kept him happy.为什么用all that不用a...
1.The thought of going back home was ___ kept him happy.为什么用all that不用all what?
2.Human facial expressions differ from those of animals in the degree ___ they can be controlled.为什么用to which不用for which?
1.The thought of going back home was ___ kept him happy.为什么用all that不用all what?
2.Human facial expressions differ from those of animals in the degree ___ they can be controlled.为什么用to which不用for which?
问题解答：
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