It is not ---_______ for me to return all the books to the library now because I still need some of them for my research.<br>　A) continuous B) difficult C) convenient D) sufficient<br>

It is not ---_______ for me to return all the books to the library now because I still need some of them for my research.
　A) continuous B) difficult C) convenient D) sufficient

出自：东北农业大学大学英语Ⅲ

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