When and where to go for a summer holiday ______yet.

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问题 When and where to go for a summer holiday ______yet.

选项 A、are not decided
B、has not been decided
C、is not being decided
D、have not been decided

答案B

解析 本题考查主谓一致和动词时态。句意:(我们)还没有决定什么时候和去哪里度假。“疑问词+to do”做主语时,谓语动词应用单数。而yet常与现在完成时连用,所以答案为B。
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