分析其句子成分?Until now scientists had very little clear evidence about the drug's role in preventing more serious effects of infection.“about drug's role”是不是介词短语作补语?“in preventing more serious effects of infection

来源：学生作业帮助网编辑：作业帮时间：2024/05/11 01:42:17

分析其句子成分?Until now scientists had very little clear evidence about the drug's role in preventing more serious effects of infection.“about drug's role”是不是介词短语作补语?“in preventing more serious effects of infection
分析其句子成分?
Until now scientists had very little clear evidence about the drug's role in preventing more serious effects of infection.
“about drug's role”是不是介词短语作补语?“in preventing more serious effects of infection”是什么?
effect在这里是什么意思？

分析其句子成分?Until now scientists had very little clear evidence about the drug's role in preventing more serious effects of infection.“about drug's role”是不是介词短语作补语?“in preventing more serious effects of infection
至到最近,科学家对于这种药物在阻止感染的严重后果（方面）的作用只掌握很少的明确证据.
主语 scientists
谓语 had
宾语 very little clear evidence about the drug's role
宾语补足语 in preventing more serious effects of infection（个人感觉你再查查）
状语 Until now
effect 就是后果效果作用的意思
如side effect 专指药物的副作用
句子成分以把句意弄懂为主不必太苛求语法上的称谓
总之
about the drug's role in preventing more serious effects of infection 都是对 evidence 的补充说明

about drug's role是介词短语
后面那个是阻止更严重的感染反应

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