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硫的氧化反应是吸热反应,高温有利于硫的氧化()

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班级是社会的投影即是社会的缩影()

Poor speaker of English though he was at the time, he still managed to make himself ________.

A. understand
B. understood
C. understanding
D. to understand

In international matches, prestige is so important that the only thing that matters is to avoid _____.

A. from being beaten
B. being beaten
C. beatin
D. to be beaten

参考咨询系统的构建原则包括:坚持以人为本、坚持服务至上、坚持分工与协作结合、()

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