We took mother to all the best hospitals we could find, but all our efforts were in
单选题We took mother to all the best hospitals we could find, but all our efforts were in______; She passed away last month.
A.valid
B.vain
C.vacant
D.vague
参考答案：B
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答案解析：
涉及考点
2020翻译三级综合能力考试大纲
一、词汇和语法
