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________ you eat the correct foods ________ be able to keep fit and stay healthy.
A.Only if; will youB.Only if; you willC.Unless; will youD.Unless; you will
A

试题分析:考察only的倒装。部分倒装句中考查较多的是否定词或者半否定词放在句首,要使用部分倒装的形式。当only放在句首,强调状语的时候也要使用部分倒装的形式。要注意当only不强调状语的时候,就不需要倒装句了。要特别注意only后面的状语从句不需要倒装,倒装的是主句。本句if后面的条件句就不需要倒装,故A正确。
点评:部分倒装中考查较多的有:(1) 含有否定意义的词never,seldom,little. hardly,not,scarcely,nowhere,by no means(决不)等置于句首时。(2)以only修饰作为状语的副词、介词短语或从句,且放在句首时。 注意:only 修饰状语从句放在句首时,状语从句不需要倒装,只能倒装主句部分。(3)当so置于句首意为“也如此”,neither,nor置于句首意为“也不”时。当so表示对前句内容的肯定和附和,译作“确实,正是”时,用自然语序。(4)当not only…but also, so/such…that, not… until, no sooner… than, hardly… when等连词置于句首时。(5)在as引导的让步状语从句中(名词/形容词/副词/动词+as+主谓结构)。(6)虚拟语气的条件状语从句省去 if时,须将were,had,should提到句首构成倒装句。(7)频度副词often, always, once, now and then, every other day, many a time等放在句首时。(8)为了使句子保持平衡,为了强调表语或为了使上下文紧密衔接时,常使用倒装语序。
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