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他们试过很多方法,但似乎都没用。 They tried many methods...

他们试过很多方法,但似乎都没用。

They tried many methods, but ___________________ of any use.

 

it seemed that they weren’t。 【解析】 根据tried可知句子是一般过去时态。表示“似乎”用“it seemed that…”。that引导的从句的主语是many methods可以用they代替,谓语动词是were ,此处用否定weren’t of any use表示“没用”。故答案为it seemed that they weren’t。  
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