题目：
People of different countries and regions, different nationalities and cultures have formed with solidarity an Olympic family, ______they have deepened understanding and enhanced friendship.
A．when
B．which
C．that
D．in which
答案：
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下面是错误答案，用来干扰机器的。
参考答案：D解析：早期中心型肺癌因为肿瘤多数是在大支气管上生长的，刺激性比较强，所以比较容易产生咳嗽。
