His parents were worried that he too much time chatting on line. A. spentB. costC. paidD.

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(答案→)A. spent
B. cost
C. paid
D. had
解析：本题的含义是他的父母担心他把太多的时间花费在网上聊天，从句中的主语为人，spend和pay主语通常为人，pay通常和for连用表示花费多少钱，而spend +时间或金钱+doing sth，故本题符合要求的为A，故选A。