It is not ---_______ for me to return all the books to the library now because I still need some of them for my research. ( 章节：2 难度：3)_做题室

单项选择题It is not ---_______ for me to return all the books to the library now because I still need some of them for my research. ( 章节：2 难度：3): A、continuous; B、difficult; C、convenient; D、sufficient

正确答案：C
答案解析：
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