i have just arrived in china为什么加个have

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• i have just arrived in china为什么加个have
• 表状态情绪感觉精神活动的动词,不用现在完成时对吗～I have just arrived by train 这句话对吗
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• In the last decades,advances in medical technology 如下In the last decades,advances in medical technology have made it possible for people to live longer than in the past.made it 后面要不要加个 is 既 made it is possible?为什么?Before giving my opinion,I think it is important...这里用giving 是因为前面的before 能否改成 I give?Although this view is widely held,this is little evidence that education can be .虽然这个观点被广泛接受,但是很少有证据证明教育可以.是不是应该改成there is?为什么是this is?It is indisputable t
• Has the missing boy beenfound?I'm afraid not .The police _still busy looking for the missing boy.A has B are C is D have2.yang liwei is the first chinese _flew into space .yes,he is the pride of our country. A that B while C who D which3.could you tell me_? she lives in the south of china.A where she lives? D where dose she live ?为什么不选D4.excuse me .have you got trousers_my size? yes.look,they are over.A in B on C of D at5.they will have a visit to the
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