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----I don’t know if it_        tomorrow. If it       ,we won’t go on a picnic.
A. rains, rains       B. will rain, rains          C. will rain, will rain
B

试题分析:if翻译为是否,引导宾语从句。if翻译为如果,引导条件状语从句。根据句意可知,第一个if翻译为是否,第二个翻译为如果。宾语从句的结构:主语+谓语+连接词+从句。从句在句中作宾语。从句要用陈述句的语序。如果主句是一般现在时,从句根据需要选择时态,如果主句是过去时态,从句要用相应的过去时态。根据句意,该句用将来时。在if引导的条件状语从句中,如果两个动作都没有发生,为了区别动作的前后关系,先发生的用一般现在时态,后发生的用一般将来时态,即主将从现。故选B 。
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