The factory is said __with modern instruments ___ from America.
| A．to have equipped, to have introduced | B．to be equipped , introcuced |
| C．to have been equipped, having been introduced | D．having been equipped, having been introduced |
There was no more than one iPhone 4S in the store, so I had no choice but __________.
| A．take | B．taking |
| C．taken | D．to take |
The machine has been made easier for it __________.
| A．to operate | B．operated |
| C．being operated | D．to be operated |
No matter how bright a talker you are, there are times when it's better __________ silent.
| A．remain | B．be remaining |
| C．having remained | D．to remain |
I remembered __________ the door before I left the office, but forgot to turn off the lights.
| A．locking | B．to lock |
| C．having locked | D．to have locked |
George returned after the war, only __________ that his wife had left him.
| A．to be told | B．telling |
| C．being told | D．told |