题目内容
1.---Mum,can I keep a pet?---No,_________ you have enough time to care for it.( )
| A. | as | B. | since | C. | if | D. | unless |
分析 妈妈,我可以养一只宠物吗?不,除非你有足够的时间照顾它.
解答 答案:D 根据上文Mum,can I keep a pet?妈妈,我可以养一只宠物吗?回答No,后文you have enough time to care for it,结合选项,D连词unless意为"除非…如果不…","除了…",多引导一个否定意义的真实条件句,有时也可引导非真实条件句.故选D.A作为.B自从,C如果.
点评 unless不能与if'"not换用的情况 unless在意义上相当于if…not,因此在有些场合中unless与if…not可互换使用.如:Unless I am mistaken.I've seen that man before.=lf I am not mistaken.I've seen that man before.如果我没搞错,我以前见过那个人.
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