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问6道高中英语单选题,请写出解析

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问6道高中英语单选题,请写出解析
1 Many a passenger ___ complaining the delay of the flight,for the majority of them are businessmen who are short of time.A is B are
2 Goods are __ as long as they are in good condition.Aexchangeable Bexchanged
3 I,who ____ your teacher,will try my best to help you with your study.Aam Bis
4____ the climate changes so much has caused many discussions among the scientists.AWhich BThat
5____ he talked about it to reporters surprised me.AWhich BThat
6____ we can raise our production remains a problem.AWhich BHow
这些高中英语单选题为什么 正确答案都选A,请写出所选答案的理由
书上写了应该选A正确答案怎么不是B,求原因.
问6道高中英语单选题,请写出解析
1.A ("many a+名词单数"作主语时,谓动用单三,因此选A.is)
2.A (exchangeable 可交换的)
3.A (定语从句的谓动由先行词决定,先行词为I,故用am)
4.B (主语从句由that引导,which不能引导主从)
5.B (that引导主语从句)
6.B (How引导主语从句.句意:我们如何提高产量仍是一个问题)
再问: ()frightened me was a loud crash from the next room.
AThat BWhy CWhat DHow
() is his own decison.A when he is leaving B when he leaves 这几个单选正确选项是哪个,再帮个忙吧
再答: C.What (What引导主语从句,并在主从中作主语;而that引导主从时不能充当句子成分)

A. (when he is leaving 是主语从句作主语,说此话时,他还没离开,故用现在进行时表示将来动作.句意:他何时离开是他自己的决定.)
再问: 谢谢,那主语从句一般都是that、what、which、when这些词引导的吗,还有什么特征
再答: 是的,that、what、which、when能够引导主语从句,另外,whether,who,where,why,how等也可引导主语从句;要说特征嘛,那就是任何从句中都必须用陈述语序.