Not until the train pulled into the station that his suitcase was gone.
| A．had he found | B．did he find | C．he had found | D．he found |
“I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it _____ my aunt Jean.”
| A．must be | B．must have been |
| C．might be | D．can have been |
“I thought you wouldn’t mind.” “Well, as a matter of fact I don’t, but you _____ me first.”
| A．should ask | B．should have asked |
| C．must ask | D．must have asked |
You _____ be right, but I don’t think you are.
| A．can | B．could | C．must | D．should |
Their answers are exactly the same — one of them ______ from the other.
| A．must copy | B．must have copied |
| C．should copy | D．should have copied |
Do you think he is lazy？” “I _____ so once, but I don’t now.”
| A．may have thought | B．can have thought |
| C．may think | D．might think |