She _____ your birthday party, but she had to look after her mother in hospital．
题型：不详难度：来源：
She _____ your birthday party, but she had to look after her mother in hospital．| A．should attend | B．ought to have attended | | C．can have attended | D．must have attended |
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答案
| B |
解析
试题分析：考查情态动词用法。本题是虚拟语气，根据but后面的had说明本题是对过去情况的虚拟，使用情态动词+have done的形式。C项表示推测，指可能做了某事；D项指一定做了某事；ought to have done本应该做某事，实际上却未做；句意：她本应该来参加你的生日聚会的，但是她不得不照顾她生病住院的妈妈。故B正确。
点评：注意but后面的句子使用陈述语气，前面的句子要根据后面句子的时态来决定虚拟语气的形式， |
举一反三
Can you imagine that a smart man like him ___________ make such a stupid mistake?| A．might | B．should | C．would | D．need |
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I told Sally how to get here, but perhaps I ___ for her.| A．had to write it out | B．must have written it out | | C．should have written it out | D．ought to write it out |
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| Please do not feed the fish; they _____ die if they eat too much. |
—How much shall I pay for the phone call?
—You________. This is free of charge.| A．shouldn"t | B．can"t | C．don"t have to | D．mustn"t |
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. --- I"m sorry. I ____________ the bike to you yesterday. But I was too busy at that time.
--- Never mind.| A．should return | B．should have returned | C．must return | D．may have returned |
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