试题详情
- 单项选择题Silk（）by Chinese for thousands of years now.
A、has been used
B、was used
C、is used
关注下方微信公众号，在线模考后查看
热门试题
- Hello, Peter. What d
- How is everything?（）
- Would you mind if I
- （）he saw his mother
- The medicine （） cool
- Mr. Liu,（）at univers
- Finally, the Christm
- Mr. Smith（）a most im
- — Hello, Sally. How'
- Did you notice the g
- I thought that hones
- I'm a nurse. I（） Dav
- Could you say it aga
- Take these pills thr
- It's the best film I
- She（）her boredom at
- —Do you think the ex
- He kept the light in
- I'm hungry. Could yo
- The club（）children b