题目内容（请给出正确答案）

[单选题]

At Harvard, the only mandatory class for freshmen is an expository writing class. The underlined word is the opposite to _____.

A.legal

B.compulsory

C.optional

D.obligatory

提问人：网友后慧珍 发布时间：2022-01-07

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· 有5位网友选择 A，占比62.5%
· 有1位网友选择 C，占比12.5%
· 有1位网友选择 B，占比12.5%
· 有1位网友选择 D，占比12.5%

ABCD

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