【题目】Now more than 68，000 foreigners are working in Shanghai. The number is 13 times __________ in 1996，when Shanghai started issuing work permits for foreigners.
A. one B. ones
C. that D. those
在线课程【答案】C
【解析】句意：现在超过68，000名外国人在上海工作。这个数字是1996年的13倍，那时上海开始对外国人发放工作许可证。