---________ I remind you of is to return the book to our English teacher．---I will give it to him ________ I see him．A.What; the momentB.That; immediatelyC.What; whileD.Whether; once
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A解析综合考查两种从句的用法。句译为：——我提醒你的是要把书还给英语老师。——我一看见他就给他还。what引导主语从句；the moment名次连词化，引导时间状语从句。表“一……就……”。