Do you know when the Chinese custom from? --Its hard to say. But its characteristics t

问题补充：

--Do you know when the Chinese custom from?

--Its hard to say. But its characteristics the Tang Period.

A. began; prove

B. started; show

C. is; appear

D. dates; suggest

答案：

A. began; prove

B. started; show

C. is; appear

(答案→)D. dates; suggest

解析：本题关键是抓住答句中所提供的信息，“Its hard to say’，这表明回答者并不很肯定。而prove证明，show表明，排除A，B。前一空date from意为“追溯至……”