If someone spends his or her time, effort and money writing a book, for example, he or she deserves _______ for it.
A:paying
B:to pay
C:having been paid
D:being paid
回答下列问题:
材料一 下图为我国铁矿石主要进口来源示意图。
材料二 下图示意1996~2007年我国铁矿石的进口量及均价。
材料三 加工贸易是我国对外贸易的主要方式,但目前我国的加工贸易主要是进行低层次的加工,附加值低。