题目内容
17．I don't know if he _______ tomorrow．If he _______，we'll climb the mountain．（ ）| A． | comes，comes | B． | comes，will come | C． | will come，comes |
分析 --我不知道他明天是否会来．如果他来的话，我们将去爬山．
解答 答案：C
此题考查if引导的从句：if意为"是否"引导宾语从句，if意为"如果"，引导条件转语从句；
根据题干句意知第一个if为"是否"之意，故符合宾语从句时态规则，主句I don't know为一般现在时，从句可根据自身情况选择，根据答语tomorrow知是发生在将来的事，故应用一般将来时，will come；
第二个if意为"如果"故采用条件状语从句：主将从现，if所在句为从句，使用一般现在时，且主语为第三人称单数he，故填第三人称单数形式comes．故选C．
点评 此题重在考查if引导的宾语从句和条件状语从句．考生需根据句意明确判断词意，再根据不同的从句采用不同的时态．
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