I wonder why Jenny        to us recently. We should have heard from her by now.    [ ]

A. hasn't written    

B. doesn't write    

C. won't write    

D. hadn't written

结转不可修复废品的生产成本应借记“废品损失”，贷记

A．原材料

B．产成品

C．生产成本

D．制造费用