We took mother to all the best hospitals we could find, but all our efforts were in _____

We took mother to all

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

正确答案： B

答案解析: 这句话的意思是：我们带母亲去了我们能找到的所有最好的医院，但是一切努力都是徒劳的，她上个月去世了。vain意为“无益的、徒然的”；valid意为“有效的、有充分根据的”；vacant意为“空的、未被占用的”；vague意为“不清楚的、含糊的、茫然的”。根据句意，选项B为正确答案。

相关知识：一、词汇和语法

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