题目内容

7.John asked his father _________he would buy a new computer or not.(  )
A.ifB.whetherC.whyD.who

分析 John问他父亲他是否要购买新电脑.

解答 答案B.
本题采用排除法.
if是否;whether是否;why"为什么";问who"谁".
通过分析可知"_________he would buy a new computer or not."是宾语从句,再来分析宾语从句的句子成分可知不缺主语和宾(表)语,可排除连接代词who;把why放入句中时句子的意义不通顺,可排除C项;whether和if都可以引导宾语从句,表示"是否",在口语或间接引语中两者可以互换使用.但whether引导的从句常可以与连词or或or not直接连用,而if一般不能.通过以上分析可知答案选B.

点评 本题考查从属连词的用法.连词的用法辨析,要注意分析主从句之间的关系,再确定相应的连词,同时注意不同的连词的语义及用法区别.有些情况下,whether和if的用法有一定区别.1.whether引导的从句常可以与连词or或or not直接连用,而if一般不能.2.当宾语从句提到句首时,只能用whether引导,而不能用if.3.whether可以引导带to的不定式,if则不能.4.whether及其引导的成分可放于介词之后,作介词的宾语,但if不能.5.whether可以引导从句,作主语、表语或同位语,而if不能.

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