They worked out a new method by which efficiency has now been dramatically impro

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问题 They worked out a new method by which efficiency has now been dramatically improved.

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答案他们制定出一种新方案，采用之后工作效率大大提高。

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一位优秀的教师应根据学生和教材改变教学方法。______Anexcellentteachershouldvaryhisteachingmethod