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几道初中英语1.Mary and Joan's boooks与Mary's and Joan's boooks区别是什么

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几道初中英语
1.Mary and Joan's boooks与Mary's and Joan's boooks区别是什么?
2.Are these books
A.yours or John's B.your or John's
C.your's or John's D.yours' or John's
(主要是A/B不清楚)
3.If you neeed the eraser,I'll lend to you.
A.them B.it
C.that D.this
经常考的it 和that怎么用啊.
4.If you want me to help you,why don't you say
A.it B.this
C.that D.so
我要理由、谢谢了
1.Mary and Joan's boooks指的是Mary和Joan共同的书
Mary's and Joan's boooks指的是Mary的书和Joan的书 但不是共同的
2.选择A.B错在your上,如果其后没有名词,必须用名词性物主代词【yours】
your是形容词性物主代词
3.选择B.it.因为上文提到了the eraser,特指了橡皮所以用it.如果要用that后面应该加上eraser才正确
4.选择A.it .it是代词,代替you want me to help you
+that常用于比较结构中,代提前文提到的名词,以避免重复;it特指上文提到的同一事物