题目内容
6.The school rules state that no child shall be allowed out of the school during the day,______ accompanied by an adult.( )A. | once | B. | when | C. | if | D. | unless |
分析 句意:学校制策规定:在白天,除非有成人陪伴,否则孩子不允许出校门.
解答 答案:D.A.once一旦,引导时间状语从句;B.when当′′′′′′的时候,引导时间状语从句;C.if如果,引导条件状语从句;D.unless除非,引导条件状语从句.根据句意"在白天,除非有成人陪伴,否则孩子不允许出校门."可知,这里应该用unless,故选D.
点评 考查连词的用法.要掌握各从属连词的意思以及它们各引导什么状语从句,并分析句子,结合句意,判断出答案.

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