Every possible means______, but none proved successful.

admin2011-02-09  38

问题 Every possible means______, but none proved successful.

选项 A、have been tried
B、has been tried
C、have being tried
D、has being tried

答案B

解析 这句话的意思是说,所有可能的方法都已经试过了,没有成功的。means在这里是名词,表示“方法,方式”,所以正确项为(B)。
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