Students of ________ grades are those studying in the first three grades of elementary school. ( 章节：2 难度：3)_做题室

单项选择题Students of ________ grades are those studying in the first three grades of elementary school. ( 章节：2 难度：3): A、entry; B、basic; C、main; D、primary

正确答案：D
答案解析：
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