It is none of my business. It's up to you to decide______he bought yesterday is used for.A.what whatB.what thatC.that whatD.that which
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A解析本题考查名词性从句。decide后接宾语从句；在宾语从句中he bought yesterday又是个主语从句，缺主语故用what。在宾语从句what he bought yesterday is usedfor中for缺宾语，故还要用what。