B.can't
C.mustn't
D.needn't 解析:can't(不可能);shouldn't(不应该);mustn't(不可以);needn't(不必)。由句中“我刚才还看见他在屋里学习呢。”可推知“他还没走多长时间。”can表推测,主要用于否定句和疑问句中。综上,选B。 答案:B 2.情态动词+have done的其他含义 (1)“should/ought to +have+v.ed“意为“本应该”,表示过去应该做而没有做的事,也可表示惊讶、赞叹等情绪。 这样考过 (2007·陕西)I told your friend how to get to the hotel,but perhaps I________have driven her there. A.could
B.must C.might
D.should 解析:后半句的意思是:但也许我本应该开车送她去那儿。用should,构成should+have done结构,意思是:本应该做。 答案:D (2)“shouldn't/ought not to+have+v.ed”意为“本不应该”,表示过去不应该做某事但却做了。 这样考过 (天津河西区)He
________ back to work without the doctor's permission.Now,he has to stay in bed for a couple of days. A.wouldn't have gone
B.couldn't have gone C.needn't have gone
D.shouldn't have gone
解析:由句中后半句“he has to stay in bed for a couple of days.”知“他未遵医嘱”,含有“不该做某事而做了”之意,故选D。wouldn't have gone“本不会做而做了”;couldn't have gone“本不可能做而做了”;needn't have done“本不需做而做了”。 答案:D (厦门质检)You
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