分析 necessary.
解答 答案:necessary.这里是if表示如果,引导的条件状语从句,遵循主将从现的规则,从句it is necessary有必要,主谓语是it is 可以省略,故答案是necessary.
点评 if+形容词 这类结构通常可视为在if与形容词之间省略了"主语+动词be的适当形式".如:
Send the goods now if ready.=Send the goods now if they are ready.货物如已备好,请即送来.
If true,this will cause us a lot of trouble.=If it is true,this will cause us a lot of trouble.这事若是事实,它将给我们造成许多麻烦.
注:这类省略结构中有的已构成相对固定的搭配,if necessary (如果需要),if possible (如果可能)等.如:
If necessary,ring me at home.如果必要,可往我家里打电话.
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