题目内容
18．We will go camping to enjoy the nature together if they ____ time tomorrow．（ ）| A． | has | B． | have | C． | had | D． | will have |
分析 如果明天他们有时间，我们将一起去野营，欣赏大自然．
解答 答案：B
根据语境推测句意是"如果明天他们有时间，我们将一起去野营，欣赏大自然．"，本句考查if引导的条件状语从句，在含有条件状语从句中的复合句中，如果主句中用一般将来时，从句使用一般现在时表将来，一般现在时的构成是：主语+动词原形/动词的第三人称单数形式； 主语为they故用原形have．故选B．
点评 本题考查了动词的时态．做题时，一定要特别关注有关的时间短语，这是判断句子时态的标志．在没有时间状语的情况下可以联系上下文根据语境来做出正确判断．
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