“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
考查情態(tài)動詞。根據(jù)語境可知為對過去事情的推測，故用情態(tài)動詞+ have done。may have done過去也許做過某事。根據(jù)句意為：她也許沒有聽到鈴聲。故選B。
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