“ They went to the lecture, but it had been put off.” “ Oh, so they _______.”
| A．needn’t have gone | B．should have gone |
| C．mustn’t have gone | D．don’t need to go |
With all his money, he ________ worry about a little thing like 5 cents!
| A．can | B．must |
| C．may | D．should |
—It's no easy task to catch a ticket on a website that receives 1 billion clicks daily.
—I can't agree with you more. There ________ be errors for every single step.
| A．should | B．must |
| C．can | D．will |
The family ________ on time, but their car had a flat tyre on the halfway.
| A．would arrive | B．could arrive |
| C．must have arrived | D．could have arrived |
The public transportation is very convenient in that big city, so there ________ be any difficulty in traveling around.
| A．mustn't | B．wouldn't |
| C．shouldn't | D．needn't |
—Is the letter from your mother?
—Yes. But she ________ the letter herself, because she doesn't even know one word.
| A．needn't have written | B．can't have written |
| C．might not have written | D．should not have written |