【单选题】【消耗次数：1】
That day he_______his clothes before he came to see me.
①
has washed
②
washed
③
had been washing
④
was washed
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【单选题】
That day he ___________ his clothes before he came to see me.
①
has washed
②
washed
③
had been washing
④
was washed
【单选题】
That day he ___ his clothes before he came to see me.
①
has washed
②
washed
③
had been washing
④
was washed
【单选题】
Before he came to New York, he had never heard a single English word（）.
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He said that his sister ?[填空]been there one week before
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I went to the doctors yesterday. I had to wait for half an hour before he________see me.
①
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【单选题】
I went to the doctor’s yesterday. I had to wait for half an hour before he ___ see me.
①
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Jack is so ____ to his appearance that he never has his clothes pressed.
①
adverse
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③
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【单选题】
Jack is so _____ to his appearance that he never has his clothes pressed.
①
adverse
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采用虚拟样机代替物理样机对产品进行创新设计测试和评估，延长了产品开发周期，增加了产品开发成本，但是可以改进产品设计质量，提高面向客户与市场需求能力。
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为减少机械传动部件的扭矩反馈对电机动态性能的影响，机械传动系统的基本固有频率应低于电气驱动部件的固有频率的2~3倍，同时，传动系统的固有频率应接近控制系统的工作频率，以免系统产生振荡而失去稳定性。
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