We should prevent such a silly mistake _____ again.
| A．occurring | B．to occur |
| C．to be occurred | D．from being occurred |
—I’m sorry,but there’s no smoking on this flight.
—Oh,I _______ that.Sorry, I won’t again.
| A．don’t know | B．didn’t know |
| C．won’t know | D．haven’t known |
—Why did you leave that position?
—I _______ a better position at IBM.
| A．offer | B．offered |
| C．am offered | D．was offered |
—What were you doing when Tony phoned you?
—I had just finished my work and _______ to take a shower.
| A．had started | B．started |
| C．have started | D．was starting |
—You learned to drive a car quite young, didn’t you?
—Yes, my father _______ me when I was thirteen.
| A．taught | B．had taught |
| C．would taught | D．was teaching |
They said good-bye, little knowing that they _______ again.
| A．were never met | B．will never meet |
| C．never met | D．were never to meet |