For our middle school students, some courses are compulsory, while others are ______. [ ]A. flexible

所属学校：全国通用科目:英语 2022-06-08 17:26:35

问题描述：

For our middle school students, some courses are compulsory, while others are ______.

[ ]

A. flexible B. optional C. impressive D. significant

考点提示：形容词

最佳答案：

B

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