考试
2021-01-11 09:14:29

The teacher has done his best

题目描述

A、help his students to improveB、to help his students to improveC、helps his students to improveD、helped his students to improve

答案解析

[db:答案解析]

B分析do one’s best to do(不定式) 尽某人最大努力做…

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