--- I called you last night, but nobody answered the phone.
--- Sorry, ________.
| A．I must be sleep at that moment. | B． I must have slept at that moment. |
| C．I must have been asleep at that moment. | D．I must have fallen asleep at that moment. |
He studied the project carefully, determined ______ it ahead of time.
| A．finish | B．finishing | C．to finish | D．to have finished |
—Hi, Lucy, I’m wondering whether I can use your mobilephone for a while.
—I hate to say, but ______.
| A．it’s being repaired | B．it has been repaired | C．it’s repaired | D．it had been repaired |
The bus crashed into a truck in front of it, ______ 40 deaths and more wounded.
| A．cause | B．causing | C．caused | D．to cause |
I bought a dress for only 10 dollars in a sale; it was a real ______.
| A．exchange | B．business | C．bargain | D．trade |
Will you have a free evening tonight? ______, let’s have a dinner together.
| A．If not | B．Why not | C．If so | D．What’ more |