— They are said to have been familiar with each other.
— But they_________. They were introduced only hours ago.
| A．may not have been | B．couldn’t have been |
| C．mustn’t have been | D．needn’t have been |
推荐试卷
— They are said to have been familiar with each other.
— But they_________. They were introduced only hours ago.
| A．may not have been | B．couldn’t have been |
| C．mustn’t have been | D．needn’t have been |
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