At the end of the eighteenth century, masks _________ completely.
| A．ban | B．had banned |
| C．banned | D．were banned |
Wang Ling, one of my friends, is very good at English. He speaks English as if he ________ an Englishman.
| A．were | B．would be |
| C．have been | D．had been |
The teacher agreed to the suggestion that the students ________ two weeks to prepare for the exam.
| A．give | B．should give |
| C．be given | D．would be given |
I would have come earlier, but I ________ that you were waiting for me.
| A．didn’t know | B．hadn’t know |
| C．would have known | D．haven’t known |
But for the party, he ________ of hunger fifteen years ago.
| A．would have died | B．would die |
| C．must have died | D．must die |
. If only I ________ how to operate an electronic computer as you do.
| A．had known | B．would know |
| C．should know | D．knew |