We'll have a barbecue in the country________it rains tomorrow．A.ifB.whenC.unlessD.now that
网友回答
C解析分析：unless(除非)＝if not，引出一个条件状语从句，从句中用一般现在时表示将来。原句＝We'll have a barbecue in the country if it doesn't rain tomorrow．注意：由于unless本身有否定的意义(＝if not)，所以不要在unless从句中用否定结构。