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1、

I must drop a line to your sister to thank her for helping us.

我得给你姐姐写封信,去感谢她给我们帮忙.

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2、

I will drop a line to him tomorrow.

我明天会写封信给他.

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3、

We often drop a line to each other.

我们经常互通书信.

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4、

I must drop a line to my mother.

我必须给我母亲写封信.

辞典例句

5、

I must drop a line to my uncle to thank him for having us.

我得写封信给舅舅,感谢他邀请了我们.

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