[文法] must be Ved的用法

[woowoo0208 (嗚嗚)]

原文

Today, practitioners of sports medicine must be prepared to advise athletes

about the serious the health risks associated with such drug use.


我想問的是為什麼要用被動式阿?

是must的特殊用法嗎?


感謝回答的大大

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→ dunchee:不是被動. 參考:
→ dunchee:http://www.ldoceonline.com/dictionary/prepared