Sincetherearemanyexcellentathletescompetingagainsteacho...

問題詳情：

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

知識點：主語從句

題型：選擇題