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—How about going boating if it_____ tomo...

—How about going boating if it_____ tomorrow.  —But nobody knows if it _______tomorrow.

A. won’t rain; rains    B. doesn’t rain; rains

C. doesn’t rain; wil1 rain    D. won’t rain; will rain

 

C 【解析】句意:——如果明天不下雨,去划船怎么样?——但是没人知道明天会不会下雨。根据How about going boating可知,if引导的是条件状语从句,从句应该用一般现在时态;又因为But nobody knows if it…可知,考查宾语从句,if引导的是宾语从句,表示“是否”,当主句是一般现在时态,宾语从句应该根据需要选用任何时态。又因为tomorrow是表示将来的时间状语,所以从句应该用一般将来时态,故答案选C。 点睛:if引导的条件状语从句,当主句是一般将来时,从句用一般现在时表示将来的含义,就是我们常说的“主将从现”,unless也有类似的用法,unless作为连词引导条件状语从句时,可以表示“如果不”或“除非”,unless=if not,如:We will go to the park if it doesn’t rain tomorrow. 可以改写为:We will go to the park unless it rains tomorrow.  
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