题目内容
4. It is common for students to make such kind of grammar mistakes.
A. not easy B. not difficult
C. not often D. not unusual
4.D common意为“常见的;普遍的”,与not unusual意思相近。
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题目内容
4. It is common for students to make such kind of grammar mistakes.
A. not easy B. not difficult
C. not often D. not unusual