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帮我检查句子Thenyoucheckagainandagainbutcannotfindoutwherethemistakeslie这里用lie后面用加什么介词吗?还有时态对吗?完整的句子是whenyouareworkingonamathproblem,youcanhardlyavoidmakinganylogica

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Then you check again and again but cannot find out where the mistakes lie
这里用lie 后面用加什么介词吗?还有时态对吗?完整的句子是when you are working on a math problem,you can hardly avoid making any logical mistakes.Then you check again and again but cannot find out where the mistakes lie.后面要用过去时间吗
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应该是对的吧,但我觉得用are更好;
后面不需要加介词,因where是个副词;
时态是对的,就用一般现在时.