摘要：9．A 考查虚拟语气.由下文的could have done来看.这里使用的是虚拟语气.四个选项中只有but for 有这种方法.
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A. might have been B. can’t have been
C. must have been D. can have been
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A. have known B. knew C. would know D. had known
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He suggested your attention ______ on your study. 【江苏省泰州市2010―2011学年度高三调研考试】【情态动词及虚拟语气】
A. should fix B. fix C. fixed D. be fixed
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