The visit of the police was the lost child .A. connected withB. joined withC. connecting

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(答案→)A. connected with
B. joined with
C. connecting with
D. joined to
解析：词义辨析，connect with连接、与……联系join with和……结合join to连接到。动名词做表语表示一般性的抽象的动作，过去分词做表语表示发生过的被动的动作。根据题意，警察的来访与丢失的孩子有关系。故选C。