―Look! What a mistake! Why?
―Sorry, I _________ on it.
| A．don’t concentrate | B．hadn’t concentrated |
| C．haven’t been concentrating | D．wasn’t concentrating |
We lost our way in that small village, otherwise we ________ more places of interest yesterday.
| A．visited |
| B．had visited |
| C．would visit |
| D．would have visited |
We ________ the difficulty together, but why didn’t you teel me?
| A．should face |
| B．might face |
| C．could have faced |
| D．must have faced |
—Do you think George has passed the driving test?
—No. If so, he ________ his car to our college yesterday.
| A．would drive |
| B．drove |
| C．would have driven |
| D．had driven |
I _______ myself more—it was a perfect day.
| A．shouldn’t have enjoyed |
| B．needn’t have enjoyed |
| C．wouldn’t have enjoyed |
| D．couldn’t have enjoyed |
—Must I return this magazine within one week?
—No, you ________.
| A．didn’t have to |
| B．mustn’t |
| C．hadn’t better |
| D．shouldn’t |