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英语强调句选择题~1._____precisely triggered off yesterday's riot is

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英语强调句选择题~
1._____precisely triggered off yesterday's riot is still unclear.
A. What B. How
2.It ___ at Christmas that John gave Mary a handbag.
A. may have been B. maybe C. has been D. may has been
选哪个?为什么是have或者has?
3. I was driving north through Vermont ____ I noticed a young man holding up a sigh reading "Boston".
A.when B.where
4. The rain was so heavy ____our picnic impossible.
A. to make B. as to make C. making D. in order to make
应该选哪个?我觉得应该选c,对么?
5. ______ often, people have wrong ideas about other countries because they have never known natives of the countries personally.
A. All B. All but C. All too D. So
应该选哪个?为什么?
6.The effect on our blood chemistry is ____ that it products physical changes in our entire body.
A. such B. so
选这两个有什么区别么?应该选哪个?
谢谢解答~
1、what 引起主语从句
2、A may为情态动词,后面用动词原形
3、A 句意:当我开车向北穿过“vermont”的时候,我注意到一个年轻男人正向上举着一个牌子,上面写着"boston"
4、B so...as to do sth.如此.以至于.
6、A such是代词,可以放在be动词后面作表语,而so为副词,只能修饰形容词或副词.
再问: 谢谢回答哦~很准确~ 第2题为什么不能选c呢? 第3题为什么不能选where?强调开过vermont这个地方时看到boston的牌子。。。。对不起,when和where我一直都不知道应该选哪个。。。 谢谢~
再答: 不好意思最近才连上网~~ 第二题不选c是因为看到后面是gave了么,这是过去时,所以就算用也要用had been而不能是has,而且a更为恰当~ 第三题么,我的理解是这样的,其实很多情况下这些确实不太好分,你多做些题,多思考下,时间长形成语感了看到题就选择出来了,这也是为什么很多英语成绩不错的人却不太会讲题的原因~ 如果你想用where,那么就是说是关系副词的定语从句,这样where代指的意思是through vermont,结合后面的句子“一个年轻男人举着一块写着”boston“的牌子穿过vermont”?这样意思就不对了,所以用when是正确的~ 希望能帮到你~O(∩_∩)O~