Victor apologized for __________ to inform me of the change in the plan.
| A．his being not able |
| B．his not being able |
| C．him not to be able |
| D．him to be not able |
Once a programme ________ put into a computer, it ________ accordingly.
| A．is; acts | B．is being; is acting | C．has been; will act | D．will be; acts |
I’m glad to see that you ________ a lot of progress since I ________ you last.
| A．will make; have met | B．have been making; met |
| C．had made; met | D．have made; meeting |
－Oh, it’s you, Steve! I ________ you.
－No surprising. I’ve just had my hair cut.
| A．don’t recognize | B．haven’t recognized | C．didn’t recognize | D．hadn’t recognized |
I would have come sooner but I ________ that they were waiting.
| A．haven’t known | B．hadn’t known | C．don’t know | D．didn’t know |
—Did you find the missing couple in the mountain yesterday?
—No, but we ________ to get in touch with them ever since.
| A．have tried | B．have been trying | C．had tried | D．had been trying |