You had better have your shoes mended.mended为什么是过去式呢?

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• You had better have your shoes mended.mended为什么是过去式呢?
• 对于现在完成时的提问的一些问题先举个例子：when _ you _ this book?I _ it for two weeks A、have；bought ；have had B、did ；buy ；have had 我知道答案是A,但我后来冒出了一个疑问 如果选B,语法上也没有错误,并且我曾经看到过这样一个句子：when did you finish your homework I have just finished my homework.那像这样的问句,什么时候问句里加完成时,什么时候加一般过去式呢
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• 英语有几题不会啊!帮帮忙忙1.With all this work on hand,he _ to the cinema night.A must not goB would not goC ought not goD should not have goone 2 The line is busy,someone_the telephone now.A should be usingB must have beenusingC usesD must be using3 You__qiut your job until you find another one A had better do not B had better not to C the better not toDwould better答案DCD为什么呢?
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• _if you had lost your watch?答案是wouldn't you be upset 我填的是wouldn't you have upset 为什么呢
• You had better have your shoes mended.mended为什么是过去式呢?
• Your father is sleeping.you had better not wake him up.为什么用have的过去式had
• _if you had lost your watch?答案是wouldn't you be upset 我填的是wouldn't you have upset 为什么呢
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