1 . — Excuse me, where is George?
— George ________ too far. His coffee is still warm.
— George ________ too far. His coffee is still warm.
| A．must have gone | B．might have gone |
| C．can’t have gone | D．needn’t have gone |
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2 . The children________very excited as they opened Christmas gifts from their parents.
| A．must have been | B．must be | C．can have been | D．can be |
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3 . Since nobody could help Mary with her study, she________ have finished it by herself.
| A．can | B．need | C．must | D．should |
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