—Why didn't you answer my phone when I phoned you at about 11 p. m. yesterday?
—I ___________and failed to hear the phone.
| A．might have slept | B．must be sleeping |
| C．might be sleeping | D．must have been sleeping |
—Would you like to play bridge with us?
—Sorry._________.
| A．With pleasure | B．No problem | C．It isn't my cup of tea | D．It is a piece of cake |
The idea has been widely accepted Beijing Opera should be added to the basic education in China.
| A．/ | B．when | C．which | D．that |
_____ the telephone number several times, but he couldn't learn it by heart．
| A．Having told | B．Having been told |
| C．Although he had been told | D．He had been told |
It was five o’clock in the afternoon _____ they climbed up to the top of the mountain.
| A．since | B．when | C．that | D．until |
—Ready to quit guessing, Sandy?
—No, no, I hold on! I think I _____ to the answer.
| A．come | B．have come | C．am coming | D．came |