– Why does she look so tired?
-- She ________ all the morning and she still hasn’t finished it.
| A．cleaned | B．was cleaning | C．has been cleaning | D．has cleaned |
—Shall I go and buy two more bottles of beer?
—No, I’ve already bought twenty. That ___ be enough for us two.
| A．can | B．may | C．ought to | D．might |
.—Did you visit the museum? —No, we ____ it, but we spent too much time shopping.
| A．could have visited | B．must have visited |
| C．can’t have visited | D．shouldn’t have visited |
Crusoe had to stay in cave, ___ go out, even for food.
| A．daring not to | B．not daring to | C．not daring | D．daring not |
If you want to borrow a football after school, your student ____ here.
| A．has to leave | B．mustleave | C．has to be left | D．mustbe left |
Since she is angry, we ____ her alone.
| A．had better to leave | B．would rather to leave |
| C．might as well leave | D．should as well leave |