Had you devoted more energy to your lessons,you would not have been less disappointed

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• 要用英语语法知识一个一个说明1.If human beings had been a bit less greedy and cruel,more birds and animals __ dying out.A.ought to avoid B.could have been avoided C.should have avoided D.might have avoided2 As you know,I am a disabled man,but I would be very happy if I __ of service to you.A.would be B.have been C.should be D.am3 I would have come to see you earlier,but I __ _ too busy.A.had been B.were C.was D.would be4 I ___you a valuable present for your birthday
• Had you devoted more energy to your lessons,you would not have been less disappointed
• 有3道英语选择题.1.If you plant watermelon seeds in the spring ,you( )fresh watermelon in the fall.A.eat B.would eat C.have eaten D.will be eating为什么不能选B啊?是不是后面不能用would那种的?2.For many years,people( )electric cars .However,making them has been more difficult than predicted.A.had dreamed of B.have dreamed ofC.dreamed of D.dream of这题为什么不选C啊?为什么一定要在前面加一个have?3.The traffic rule says young children under the age of four and ( )less than 40pounds must be in a child s
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• 某水库通过两条水渠分别向80千米和120千米的A、B两地供水,供水时水渠平均每千米损失100立方米的水,AB两地分别需要10万立方米和24万立方米的水.水库先向两地同时供水,直到完成向A地的输水任务后再单独向B地供水,这样前后共用60小时.
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