请问这道题划线处该填什么?Every means _______tired to improve teaching and learning.
A.has
B.has been
C.have
D.were
反正答案发生歧义在A和B上,最好能附上讲解.
人气：463 ℃ 时间：2020-06-07 18:06:47
解答
是B
每一种方法都被试过去提高教和学（翻译欠佳）
means是方法的意思,在这里是被动,所以用have been done 形式
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