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We’ll climb the mountain _______ the weather is bad this weekend.
A.ifB.whenC.untilD.unless
D

试题分析:句意:我们将会爬山,除非这个周末天气不好。IF是如果的意思,如果结果是肯定的那么IF后面引导的从句(从句在主句前面用逗号隔开)用一般现在时,而主句也用一般现在时。如果结果是可能的主句(从句用一般现在时)就用一般将来时。UNLESS相当于IF NOT就是如果不/除非的意思用法和刚才IF用的一样。总结:结果是肯定的就主现(在时)从现(在时)结果是可能的就是主将从现啦。无论结果是肯定的或可能的从句都是一般现在时而变化的是主句!故选D
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