When was it your parents took you to Hangzhou?A. beforeB. ifC. which D. that

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A. before
B. if
C. which
(答案→)D. that
解析：考查强调句。强调句的结构为it is/was +强调部分+ that从句，本题为强调句的特殊疑问句。句意：你父母什么时候带你去杭州的？故D正确。