题目内容
8．We'll go out for a dinner________ it rains heavily tomorrow．（ ）| A． | if | B． | unless | C． | or | D． | whether |
分析 如果明天不下大雨，我们将出去吃晚餐．
解答 答案：B．
本题考查的是从属连词的辨析．根据语境推测句意是"如果明天不下大雨，我们将出去吃晚餐．"，这里需要一个表假设的连词，主句用一般将来时从句用一般现在时说明后句是表假设的条件状语从句，结合选项，unless可以引导一个表假设的条件状语从句，意为"除非"，相当于if not．故选B．
点评 比较和分析选项中连词的不同含义及其用法是解答该题的关键；还要根据句中信息正确推测该句句意，进而作出解答．
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