E-tickets will be used for high-speed trains ________ the country in 2019. Passe

E-tickets will be used for high-speed trains ________ the country in 2019. Passengers can enter the

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Helen ____________ (go) to a party last Sunday.

Helen ____________ (go) to a party last Sunday.

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The doctors worked for ten hours,___________nobody took a break.

The doctors worked for ten hours,___________nobody took a break.

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选出不同类别的单词。

选出不同类别的单词。

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