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They soon realized that,_____ ,the situation would get worse

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They soon realized that,_____ ,the situation would get worse.
A.unless dealing with carefully
B.if not carefully dealing with
C.unless carefully dealt with
D.if dealt not carefully with
please tell me why.
They soon realized that,_____ ,the situation would get worse
C 这是一个宾语从句,从句又是一个条件状语从句.在从句中,如果连词后的主语和主句的主语是同一个人或物,从句的主语可以省略而直接用分词.在这里situation和deal with构成被动关系,所以用过去分词.因此选C