题文
－Everyone in my class passed the exam.
－Oh，really? It________difficult.
| A．can't have been |
| B．needn't have been |
| C．must be |
| D．mightn't be |
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－Everyone in my class passed the exam.
－Oh，really? It________difficult.
| A．can't have been |
| B．needn't have been |
| C．must be |
| D．mightn't be |
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