________ I want to know, sir, is whether you have any goods in that bag _______ I should know about.A.What; thatB.What; whatC.That; whatD.That; where
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A解析考察名词性从句和定语从句。第一空What引导主语从句what I want to know,且在句中作宾语。第二空的定语从句的关系代词that指代bag作为know about的宾语。