题目内容

John ____ at the head of the table with his wife next to him. Which of the following can’t replace the underlined word.

A. seated
B. seated himself
C. was seatedD.took a seat

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2019年是新中国成立()。

A. 60周年
B. 70周年
C. 80周年
D. 90周年

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A. 焦裕禄
B. 李保国
C. 杨善洲
D. 郭明义

I am not sure how long they _____.

A. have married
B. have been married
C. have got married
D. married

简述蒸汽带水为什么会使转子的轴向推力增加?

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