—Where is Jack?I can’t find him anywhere.—He__________ his homework upstairs.A
题型：不详难度：来源：
—Where is Jack?I can’t find him anywhere.
—He__________ his homework upstairs.| A．might have done | B．must have done | | C．must be doing | D．must do |
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答案
| C |
解析
| must be doing是对目前正在发生的事进行推测。 |
举一反三
Look at the terrible situation I am in! If only I__________your advice.| A．follow | B．would follow | | C．had followed | D．have followed |
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If the horse won today，it__________thirty races in five years.| A．would have won | B．won | | C．must have won | D．did have won |
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There is a real possibility that these animals could be frightened，__________a sudden loud noise.| A．being there | B．should there be | | C．there was | D．there having been |
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I would have gone to visit him in the hospital，had it been at all possible，but I __________fully occupied the whole of last week.| A．were | B．had been | C．have been | D．was |
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I apologize if I__________you，but I assure you it was unintentional(无意的).| A．offend | B．had offended | | C．should have offended | D．might have offended |
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