—I don’t know _______________．—Don’t mention it． He is always so strange．A.what the matter with himB.what is the matter with himC.what matter with himD.what the matter is with him
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B解析考查宾语从句。“我不知道她怎么了。”“别提了。他总是很神秘。”宾语从句用陈述句语序。而短语what is the matter不用改变语序。故选B。