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Itiswonderfulthatthey()theexperimentinashorttime.AshouldhavecompletedBwouldhavecompletedCwillhavecompletedDmighthavecompleted答案是A我的疑问是,这是那个虚拟语气中should加动词原形吗?

题目详情
It is wonderful that they ()the experiment in a short time.
A should have completedB would have completedC will have completedD might have completed答案是A我的疑问是,这是那个虚拟语气中should加动词原形吗?
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答案和解析
It is wonderful that they should have completed the experiment in a short time.
太棒了,他们应该在很短的时间完成实验.
不是虚拟语气,这是情态动词加动词原形