The boss____________ the worker how to do it, or the accident couldn't have happened.
| A．can't have told | B．ought to tell |
| C．could have told | D．mustn't have told |
We all like the park _______ we visited last week.
| A．where | B．which |
| C．in which | D．what |
He said that his car ______ stolen and he _______ have to telephone the police.
| A．was; would | B．has been; will |
| C．had been; would | D．had been; will |
Those who have ______ floods and sandstorms know the importance of environmental protection.
| A．gone through | B．gone over |
| C．gone across | D．gone down |
He went _____to New York, without a stop in Hong Kong.
| A．straight | B．officially |
| C．actually | D．gradually |
______ the Smiths moved to the country a year ago, they have been enjoying a better life.
| A．Ever since | B．Now that |
| C．Even if | D．Only when |