单选题
In front of the platform, the students were talking with the professor over the quizzes of their ______ subject
A、
compulsory
B、
compulsive
C、
alternative
D、
predominant
【正确答案】
A
【答案解析】
compulsory被强制的，必修的；compulsive强制的；alternative选择性的；predominate卓越的，支配的。
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