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六选二
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NO.492
中等
00:00
本题平均耗时：2分19秒
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正确率：73%
Select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.
Biologists agree that snakes descended from lizards, but exactly where this first happened has been a matter of debate since the 1800s, when two _____ theories emerged.
complex
competing
dubious
conclusive
contending
irrefutable
Select two answer choices.
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