这是英语中省略主谓的一种情况,具体情形为：
在从属连接词if ,when,while,though,as,than,unless等所引导的句子中,当从句的主语和
主句的主语一致时,或从句的主语是it,谓语动词中又含有连系动词be,句意明确时可省略主语和
be动词.
例句：I‘ll go,if （it is）necessary.如果必要我就去
When (he was) asked his opinion ,he remained silent .当问到他的意见时,他默不作声.
这里it was为什么能省略
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