应该不是.
sth/sb be certain to do...某物/某人肯定……
it指前文提到过的东西.
这个东西（应该是某种食品吧）肯定对于人的生命是健康安全的.
又如：
He is certain to come.他肯定会来的.
这句话是不是形式主语?It is certain to be healthy
1个回答
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