A、The plane arrived at 9 am. B、The planed arrived at 12 pm. C、The plane delayed for 3 hours. D、The plane delayed for 9 hours. C

6. Flight No. GW-235 was supposed to arrive at 9 am, but we waited till noon.
7. At first, the Greens didn’t plan to participate in the closing ceremony, but they changed their minds at the last minute.
8. College graduates should by all means hunt for a job. But they should first think over what they really want to get.
9. Sometimes, only a slip of one’s pen will cost a huge loss, especially for some important projects.
10. The completion of the new stadium was not on the dot and was not available for public use until last September.