No matter how frequently _____ the works of Beethoven always attract a large number of
people.
| A．performing | B．performed |
| C．to be performed | D．being performed |
．If I _________too late last night, I could not have fallen asleep in class.
| A．didn’t stay up | B．hadn’t stayed up |
| C．don’t stay up | D．haven’t stayed up |
—Could you please lead your car to me this Sunday?
—_________you have it cleaned after using it.
| A．Although | B．So long as | C．Even if | D．As soon as |
．—We flew to Egypt for the holiday and we all had a wonderful time.
—_________.
| A．Oh, that’s very nice of you | B．Congratulations to you |
| C．Oh, I’m glad to hear that | D．It’s a pleasure |
Studying abroad, the boy was exposed to a way of life_________he was not at all fanmiliar.
| A．with which | B．to which | C．for which | D．of which |
With everyone’s face_________behind the mask, it’s hard to tell who they really are.
| A．having hidden | B．being hidden | C．hidden | D．hiding |