问题描述：
他们互相写信保持联系
They keep in touth with each other ____ _____ to each other
他们从没看过这么好的书
They ___ ____ _____ such a good book
They keep in touth with each other ____ _____ to each other
他们从没看过这么好的书
They ___ ____ _____ such a good book
问题解答：
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