here are all dinosaurs befor这句话对吗?如果对,are为什么不用过去式呢?可以换成were吗?为什么?

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• here are all dinosaurs befor这句话对吗?如果对,are为什么不用过去式呢?可以换成were吗?为什么?
• here are all dinosaurs befor这句话对吗?如果对,are为什么不用过去式呢?可以换成were吗?为什么?
• 英语语法__no air ,there would be no sound.1__no air ,there would be no sound.A were there B there wereC is there D there is2.If tap water were as dangerous as some people think,__would be getting sick.A a lot of more us B more a lot of us C.a lot of us moreD a lot more of us
• 选择题If he______here,he would agree with you. A.was B.is C.were D.will be