Beginning in fourth grade, students are expected to spend a considerable ( ) of the academic day working independently. ( 章节：4 难度：2)_做题室

单项选择题Beginning in fourth grade, students are expected to spend a considerable ( ) of the academic day working independently. ( 章节：4 难度：2): A、variety; B、intent; C、format; D、portion

正确答案：D
答案解析：
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