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求教.106.The students,______ at the way the questions were put

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求教.
106.The students,______ at the way the questions were put ,didn't know the answer to them.
A.surprise B.surprising C.having surprised D.surprised
请问如何做?麻烦再翻一下,
选D,当从句的形式主语和主句的主语一致时,主语和be动词可以省略.只有be surprised at,排除AB.没必要用到完成时态,不选C

原句The students, who were suprised at the way the questions were put, did not know the answers to them.

那些惊讶于这些题的解题思路的同学不知道这些题的答案.
(翻译我猜的)
再问: 那请问这句话,那个是从句,哪个是主句? 您所说的当从句的形式主语和主句的主语一致时,主语和be动词可以省略。这个知识点在哪个语法块里?
再答: The students did not know the answers to them.(主) The students were suprised at the way the questions were put.(从) 状语从句的省略