—Why didn't you answer my phone when I phoned you at about 11 p. m. yesterday?
—I ___________and failed to hear the phone.
A．might have sleptB．must be sleeping
C．might be sleepingD．must have been sleeping
D
本題可以采用排除法。問句中提供整個過程表示過去的行為。情態(tài)動詞后接完成時表示對過去的猜測，故排除B、C。問句中有“at about 11 p．m．”具體的時間點，所以選D。  
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