“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(dòng)詞。根據(jù)語(yǔ)境可知為對(duì)過(guò)去事情的推測(cè)，故用情態(tài)動(dòng)詞+ have done。may have done過(guò)去也許做過(guò)某事。根據(jù)句意為：她也許沒(méi)有聽(tīng)到鈴聲。故選B。
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