这句话的语法（主谓宾）?

题目

这句话的语法（主谓宾）?
A radio message from the mainland had been received by the ship's captain instructing him to give up the search.
2 Those who seek it undertake an arduous journey and can never be sure that they will find it.

答案

同学,很高兴回答你的问题正确答案：1.A radio message from the mainland had been received by the ship's captain instructing him to give up the search.主语：A radio message 谓语：had been received 宾语：t...