反义疑问句的题目！请帮忙解决啊！
1. Harry wouldn’t have become a teacher then
if it hadn’t been for the holiday, _____?
A. did he B. had it
C. would he D. had he
为什么选A啊？
不能理解啊！
2. Tom has been writing letters all afternoon,
but he should have finished them by now,____?
A. hasn't he B.has he
ouldn't he D.didn't you
为什么选C啊？而这一题为什么选B啊？
You must have been to the Great Wall, _____?
stn’tyouB.haven’tyou en’ styou3.David told me that you would take a trip to America,___?
A. would you B.wouldn't you
C. did you D.didn't you
为什么选B啊？不是说宾语从句跟主句走吗？
帮帮忙！
1、选A。难点出现在“语序”上。如果将原句改为: If it hadn’t been for the holiday, Harry wouldn’t have become a teacher then，_____? 那么答案就容易理解了---所问的是 Harry 是否会当老师，而不是那次度假。
2、该题but后面是主要陈述部分，“但到现在为止他应该已经写完信了，是不是？”语义上判断，该题是对“现在情况作可能性推测判断”，故不选hasn't he ，而用shouldn't he 。而在You must have been to the Great Wall, _____?一句中 ，must have been 表示对“过去情况做肯定性推测判断”，must这种用法仅限于“肯定句”，而且，mustn’t表示“禁止、不许”，不表判断，所以不能用。
3、宾语从句跟主句，是指“时态”，而该题考的是反义问句。 主从复合句反义问句，主语为第一人称时，反问部分与主句一致；主语为第二、三人称时，反问部分与从句一致。David不是第一人称，故依据从句定答案。从句主语是you，动词是would take ，所以反问用wouldn't you 。
。
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