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