—Why didn"t you answer my phone when I phoned you at about 11 p. m. yesterday? —
题型：不详难度：来源：
—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 slept | B．must be sleeping | | C．might be sleeping | D．must have been sleeping |
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答案
| D |
解析
| 本题可以采用排除法。问句中提供整个过程表示过去的行为。情态动词后接完成时表示对过去的猜测，故排除B、C。问句中有“at about 11 p．m．”具体的时间点，所以选D。 |
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