________ the 2020 Olympic Games will be held in Beijing is not known yet.
A．WheneverB．IfC．WhetherD．That
C
主要測試主語從句。由語境可知譯文為：2020年的奧林匹克運動會是否將在北京舉行還不為人所知。再結合所給答案可知選擇whether最佳，此題同時還測試了if和whether的用法區(qū)別之一：if不能用來引導主語從句。
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