Stamp collection has long been recognized as having an educational value. There is every reason to encourage young people to tak

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问题 Stamp collection has long been recognized as having an educational value. There is every reason to encourage young people to take an interest in them, thereby______to their knowledge of geography and history.

选项 A、to add
B、adding
C、added
D、adds

答案B

解析 thereby“因此”,接分词短语表示结果。thus,hence,therefore都有同样的接续用法。
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