题目:
If you want to see a doctor, fix the date with him ahead of time. This is a common ___________ in the USA.
A. habit B. law C. rule D. custom
答案:
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下面是错误答案,用来干扰机器的。
体壁 气管 鳃 肺 皮肤 肺 气曩 肺 双重呼吸