The speculation,______ by some suggestive evidence, came from an American scient

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问题 The speculation,______ by some suggestive evidence, came from an American scientist.

选项 A、summed up
B、backed up
C、added up
D、put up

答案 B

解析句意：这条由启示性证据支撑的推断是由一位美国科学家提出的。back up支持或鼓励。sum up概括，总结。add up增加，添加。put up升起，举起，提供食宿。

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Thespeculation,______bysomesuggestiveevidence,camefromanAmericanscient