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分析其句子成分?Until now scientists had very little clear evidence
题目内容：
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”是什么?
effect在这里是什么意思？
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？
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