I really can't think of ________ told me you were not coming back till tomorrow.
| A．it was who that | B．who was it that |
| C．that who was it | D．who it was that |
_____ to nuclear radiation, even for a short time, may produce variants (变异体) of genes in human bodies.
| A．Exposed | B．Being exposed |
| C．Having exposed | D．After being exposed |
The discovery of new evidence led to _________.
| A．the thief having caught |
| B．catch the thief |
| C．the thief to be caught |
| D．the thief being caught |
You have made a ______. You have _____ two lines from this paragraph
| A．mistake; left over | B．mistake; left for |
| C．mistake; left out | D．mistake; left behind |
He _____ to the meeting ten minutes earlier, but he was _______ by a heavy fog.
| A．was supposed to come; held out |
| B．is supposed to come; held back |
| C．is supposed to have come; held up |
| D．was supposed to come; held back |
– I wonder if you could go with me to the cinema.
--- Don’t disturb me. I ______ a composition all the morning and haven’t finished it yet.
| A．write | B．was writing |
| C．have written | D．have been writing |