题目内容

I don’t know _____.
A.what happened to himB.what did he happen
C.what he happenedD.what was the matter
A
考查宾语从句。特殊疑问句做宾语时,应用陈述句语序,可排除A,D选项语序不变,但是时态应用一般现在时态。what happened to sb,表示某人怎么了,句意:我不知道他怎么了。故选A
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