-I knew she was in because I heard her radio but she didn’t open the door. - She
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—I knewshe was in because I heard her radio but she didn’t open the door.
— She________ the bell.
A．may not hear
B．may not have heard
C．mustn’t have heard
D．mustn’t hear
试题答案
答案：B
解析：| 由第一句知道时态为过去时，may not可能没有，mustn’t禁止。
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