2. 外语
  3. Your service is entirely ______ not compulsory.

Your service is entirely ______ not compulsory.

admin2009-02-10  27
问题 Your service is entirely ______ not compulsory.
选项 A、selective
B、optional
C、voluntary
D、reluctant
答案C
解析 voluntary意为“自愿的，；志愿的”；selec-tive意为“选择的，选择性的”；optional意为“随意的，任选的”；reluctant意为“不情愿的，勉强的”。
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