题目内容
1．I don't know he will come or not this afternoon．（ ）| A． | if | B． | when | C． | whether |
分析 我不知道他今天下午是否会来．
解答 答案：C
根据语境以及上下文，本题考查的是连词的用法． 根据语境he will come or not this afternoon，结合主句I don't know可知说话人不知道他是否会来，表示"是否"用if或whether，但是与or not 连用时用whether不用if，所以应该用whether"是否"，故选C．
点评 比较和分析选项中连词的不同含义及其用法是解答该题的关键；还要根据句中信息正确推测该句句意，进而作出解答．
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