—I’m not sure ______ Bill will come or not.
—No, he isn’t.
A．whenB．if
C．whetherD．weather
C

試題分析：句意：我不確信是否比爾來還是不來。他不來。A. when何時(shí)B. if 是否C. whether是否，經(jīng)常和or not 連用D. weather天氣。根據(jù)句意及回答，故選C
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