中文谷Sincetherearemanyexcellentathletescompetingagainsteacho...
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问题详情：
Since there are many excellent athletes competing against each other in the game, it is uncertain __________ he will succeed in winning the medal.
A. that B. what C. whether D. where
【回答】
C
知识点：主语从句
题型：选择题
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