几个英语选择题1 Every year about one million tourisits visit Stoneh

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几个英语选择题
1 Every year about one million tourisits visit Stonehenge,which is believed___before the Pyramids,about 4000 years ago.
A to build B to have built C to be built D to have been built
2 Electronic devices such as iPods and headphones can do great harm to our hearing if___improperly.
A being used B used C to be used D having been used
3____seems to be no possibility____Bob can win the first prize in the match .
A There ;that B It;that C There ;whether DIt ;whether
4 It was at the the very beginning ____Mr.Fox made the decision___we should send more fire-fighters there
.A when ,which B where ,that C that that D then, so
选什么能详细解释一下吗?谢谢 ,我在急等 !
唉，四个回答没有一个全对的。。。DBAC

你真好学!
答案简单解释如下,如有不懂,欢迎追问或Hi我!
1、不定式完成式,表示build 的动作在【 is believed】之前已经完成
2、条件状语从句中的省略.
补充完整是：if 【they are used】 improperly
3、There is/was no possibility that 固定句型的变化
将其中的 is可以替换为 seems/seemed;appears/appeared.
4、第一个that,强调结构的 that;
第二个that,decision后面的【同位语从句】.
祝你开心如意!

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