The reality is, as it has always been, that teaching is a rewarding, but at times ________ profession. ( 章节：1 难度：3)
- A、instructing
- B、benefiting
- C、well-paying
- D、frustrating
正确答案:D
答案解析:有
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The reality is, as it has always been, that teaching is a rewarding, but at times ________ profession. ( 章节：1 难度：3)
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