It’s said that they have swum to the island from the continent, but they because the ocean in between is too wide. (do) 答案:can’t/ couldn’t have done it 考点:情态动词 解析:当要对过去进行肯定的推测时.要用 “can’t/couldn’t+have+done 的结构 12 .Doctors say that exercise is important for health, but it be regular exercise. A．can B．will C．must D．may 答案:C 句意:医生说锻炼对身体重要.但是必须是有规律的锻炼. 解析:考查情态动词.Can一般表示“可能.或能力 ,will表示“意志 ,may表示“许可. 可能 ,must表示“必须 . 【
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