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题目内容
（佳木斯大学语言治疗学）
—Why didn.t you answer my phone wheI phoned you at about 11 p. m. yesterday—I ________and failed to hear the phone. ( )
·might have slept
·must be sleeping
·might be sleeping
·must have beesleeping
·might have slept
·must be sleeping
·might be sleeping
·must have beesleeping
参考答案
