第二节:语法和词汇知识(共15小题,每小题1分,共15分)
从每小题所给A、B、C、D四个选项中,选出可以填入空白处的最佳选项。
Our teachers are really ______. They often work in their office far into the night.
A. open-minded B. hard-working C. self-confident D. warm-hearted
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