中文谷Whenandwherethistookplace
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问题详情：
When and where this took place _____ still unknown.
A. is B. has
C. were D. are
【回答】
A
知识点：动词时态与语态
题型：选择题
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问题详情：
When and where this took place _____ still unknown.
A. is B. has
C. were D. are
【回答】
A
知识点：动词时态与语态
题型：选择题
