一些初中英语选择题最好解释一下为什么谢谢.1.When and Where this took place______

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一些初中英语选择题
最好解释一下为什么谢谢.
1.When and Where this took place______ still unknown.
A.has B.is C.were D.are
2.I know that all _____ getting on well with her.
A.seem B.is C.are D.were
3.The pair of shoes _____ worn out
A.had been B.have been C.were D.was
4.A professor and a writer ____ present at the meeting.
A.had been B.were C.is D.was
5.Over 80 percent of the pople here ＿＿ workers.
A.will be B.are C.is D.was

1B:is
when and where this took place
是个整体,句子的意思是：（这个事情什么时候在哪发生）仍然不被人知,括号内这个整体不被人知道,所以必然是用is ,时态有后边的still unknown可知用一般现在
2选b [我知道她一切顺利.]
all若指物,则理解为单数,若指人则理解为复数.
本句的all指的是物,相当于everything,单数.
3d单复数看pair 而不看shoes 如果是pair(a pair of,the pair of)表示单数,如果是pairs(two\three pairs)表示复数,这里表示鞋子被穿旧了被动 was wore out
4 b 这里表示两个人如果 writer 前没有a 就表示一个人（这个人既是教授又是作家） be present 意思是到现场这里用过去式到会议现场
5b 这里看people 它是可数名词,有复数,如果改成water (Over 80 percent of the water is..)

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