如果主语是一个物体的时候,一般是to后面加名词,因为指代的是一个现有事物 例:a good diet is essential to health. 如果主语是形式主语it的时候,一般to是不定式,因为指代的是一个目前还...
PAT BODNAR: In the past, some people forced poisoning victims to empty the stomach. They used a liquid -\- syrup of ipecac -\- to do this. But a leading medical organization no longer advises parents to keep syrup of ipecac. The American Academy of P...
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