—Look, John’s fallen asleep.— Oh, he _______ too late last night.
| A．might sit up | B．should have sat up | C．could sit up | D．must have sat up |
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—Look, John’s fallen asleep.— Oh, he _______ too late last night.
| A．might sit up | B．should have sat up | C．could sit up | D．must have sat up |
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