题目内容

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

试题分析：句意：我不确信是否比尔来还是不来。他不来。A. when何时B. if 是否C. whether是否，经常和or not 连用D. weather天气。根据句意及回答，故选C
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