单项选择题
-- What about the book --Oh, very good. It's worth () a second time.
A. reading B. being read C. to read D. to be read
单项选择题 -- I'm sorry for keeping you waiting.-- Never mind. I () here only a few minutes.
单项选择题 While () in China, the young man picked up some Chinese.
单项选择题 --When did it begin to snow--It started () the night.
