The students asked .A. when can they surf the Internet in classB. when could they surf the

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A. when can they surf the Internet in class
B. when could they surf the Internet in class
(答案→)C. when they could surf the Internet in class
D. when they can surf the Internet in class
解析：考查时态和宾语从句的语序。所有的名词性从句都使用陈述语序，排除AB；asked是过去时，后面的宾语从句也应该使用过去时。