无论多忙,你都应该抽时间看望父母。

无论多忙,你都应该抽时间看望父母。

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我们向李先生学习,因为他有丰富的工作经验。

我们向李先生学习,因为他有丰富的工作经验。

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Even though a government realizes the importance of a plent

Even though a government realizes the importance of a plentiful supply of trees

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Our school leavers face so much competition that they seldo

Our school leavers face so much competition that they seldom care what they do

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y=(cos2x-sin2x)tan2x的最小正周期是(  )

y=(cos2x-sin2x)tan2x的最小正周期是(  ) A.π/2 B.π C.2π D.4π

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