题目内容
1．We're not sure if it tomorrow．If it ，we won't go hiking．（ ）| A． | will rain；rains | B． | will rain；will rain | ||
| C． | rains；rains | D． | rains；will rain |
分析 我不确定明天是否下雨，如果下雨我就不去徒步旅行了．
解答 答案：A 根据We're not sure if可知，if在动词后面，它引导的是宾语从句，表示"是否"．当主句是一般现在时态或含情态动词的句子，宾语从句应该根据需要选用任何时态．此句由tomorrow可知，用一般将来时态，排除CD；又根据If it，we won't go hiking可知，if引导的是条件状语从句，当主句是一般将来时态，从句应该用一般现在时态表将来，我们称这一现象为"主将从现"，排除B，故选A．
点评 本题考查宾语从句，做题时注意三要素时态、语序和引导词，注意if引导的宾从和状从的时态区分．
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