“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 |
---May I remind you that Mr. White is waiting outside, Mrs. Green?
---Oh, I _________ all about it.
| A．forget | B．had forgotten | C．forgot | D．was forgetting |
Sixty miles ________ in a single night, so they were exhausted.
| A．were covered | B．have covered | C．was covered | D．has covered |
--- Had we been more careful, the accident might not have happened.
--- But we _____ at that time.
| A．hadn’t | B．didn’t | C．weren’t | D．might not |
He will stop showing off，if no notice of him．
| A．is taken | B．will be taken | C．taken | D．has taken |
—Remember the first time we met, Jim?
—Of course I do. Youin the library.
| A．were reading | B．had read | C．have read | D．read |