题目内容


“I know she was in because I heard her radio, but she didn’t open the door.” “She___the bell.”
A．may not be hearing B．may not have heard
C．must not have heardD．must not be hearing
B
考查情态动词。根据语境可知为对过去事情的推测，故用情态动词+ have done。may have done过去也许做过某事。根据句意为：她也许没有听到铃声。故选B。
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