We have enough stock______ hand to fill your repeat order. If yo

We have enough stock______ hand to fill your repeat order. If you would like us to do so,please call us at once.
A、off
B、in
C、on
D、by
【正确答案】：C
【题目解析】：[解析]句意：我方现有足够存货来满足你方的追加订单，如果你方想我方这样做，请即刻来电告知Don hand表示“在手头，在近旁，现有”，为固定搭配。