A tiger can't be tamed unless very young.A.being caught B.caughtC.it being caught D.it's being caught 英语
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【答案】 选B,托福考过.
当从句的主语与主句的主语相同或为it,且从句谓语中含有be动词时,有时可将从句的主语和be动词省去.这种省略见于一些时间、地点、条件及让步状语从句中.
A tiger can't be tamed unless (it is) caught very yound. 追问： 额 那选A为什么错啊 unless后面可以加短语跟句子 这里being做非谓语 求解？？？？？ 追答： caught不就是非谓语吗？你试着还原成A tiger can't be tamed unless it is being caught very yound.看看is being，这里A选项是考察非谓语动词常出现的干扰选项，“永陪”选项。