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、（）
为了防止竹简虫蛀和霉烂，在书写之前需要进一步加工处理，这道工序叫（）
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