I'm sorry. I _____________ you__________ to me.
| A．don't know; are speaking | B．don't know ;were speaking |
| C．didn't know; were speaking | D．didn't know; are speaking |
I have many friends, ______ some are businessmen.
| A．of them | B．from which | C．who of | D．of whom |
There was _____ time ______ Irap was one of the strongest countries in the world.
| A．a when | B．a that | C．that that | D．the when |
The old man,_______ abroad for 20 years, is on the way back to his mother land.
| A．to work | B．working | C．having worked | D．to have worked |
With his lips still _______ ，he couldn’t say a word．
| A．trembling | B．tremble | C．to tremble | D．to be trembling |
The purpose of technology is to make it easier ,______ it more difficult.
| A．not make | B．making not | C．not to make | D．do not make |