What a pity! Considering his ability and experience，he___ better．

A．need have done

B．must have done

C．can have done

D．might have done

下面关于采购退货流程错误的是（）。

A.发票未录入系统可以不必让供应商开红字发票，直接退票即可

B.发票已录入系统就必须让供应商开红字发票

C.发票已结算就必须让供应商开红字发票

D.如果供应商开红字发票则还要与红字入库单进行结算