This is my____dictionary.A.sister Mary B.sister's C.sister,Mary's D.sister's Mary's为什么选D,不选B或C.是我看错答案了，答案选的是C,B为什么不对呢？

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This is my____dictionary.A.sister Mary B.sister's C.sister,Mary's D.sister's Mary's
为什么选D,不选B或C.
是我看错答案了，答案选的是C,B为什么不对呢？

如果是C的话,那必须有个逗号,this is my sister,Mary's dictionary.
如果没有逗号,那么就是D.
至于B,我觉得是对的,至于答案为什么D,我说不出来,在我来看,D是没错,但是B也同样没错.只是表达的意思D更具体,B只是说这是我姐姐的词典,而D说这是我姐姐玛丽的词典.

This is is this This is THIS IS this is this is this is 比如 this is fly Is this a book? Yes,this is. This is life .This is live! This is Mary.意思不变：This is （ )( ) This Is Me,This Is You 歌词 This is a man提问( ) is this? this is kangkang.为什么用this is 《This is my This is my This is (he).This is (me). what is this?-It is. What is this?It is Is this?your friend is