如果表示说话人的看法, 想法或意见, 在句型 “It is / was + adj. + that从句 中, 主语从句中可用虚拟语气. 主语从句中谓语动词用should do表示现在或将来情况, 用should have done表示过去情况 a. It is necessary that you should clean the lab before you left. b. It is important that you should take the doctor’s advice. c. It was very strange that he should have left without say goodbye. 【
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