问题
选择题
When and where to enjoy our summer vacation _____ yet. [ ]
A. aren't decided
B. isn't being decided
C. hasn't been decided
D. haven't been decided
答案
答案：C
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When and where to enjoy our summer vacation _____ yet. [ ]
A. aren't decided
B. isn't being decided
C. hasn't been decided
D. haven't been decided
答案：C