This university offers a wide variety of high-quality ______ courses for both gr

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问题 This university offers a wide variety of high-quality ______ courses for both graduate and undergraduate students.

选项 A、select
B、choice
C、alternative
D、optional

答案 D

解析 optional可选择的，非强制性的。select精选，选拔。alternative两者择一的，另类的。

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