I haven't heard from him for long. ________?A.Do you suppose what has happened to himB.Do you suppose what he has happenedC.What do you suppose he has happenedD.What do you suppose has happened to him
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D解析考查宾语从句的用法。do you think /believe /expect /suppose在句中作插入语，后接特殊疑问词引导的宾语从句时，要将特殊疑问词放在从句句首。如：Who do you suppose is at home？你猜谁在家？由句意“你猜他发生了什么事”，可知D项正确。sth happen to sb是固定搭配，指“某人发生某事”。