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She is not certain about __________ she has done anything wrong.
A.ifB.whetherC.thatD.What
14-15高一下·江苏宿迁·期中
知识点:thatwhatwhetherthat,if, whether引导的宾语从句 答案解析 【答案】很抱歉,登录后才可免费查看答案和解析!