问题补充：
It is getting late. I am afraid I must be going now!
OK,
A. Take it easy
B. Take time out
C. So long
D. Stay longer
答案：
A. Take it easy
B. Take time out
(答案→)C. So long
D. Stay longer
解析：四个选项分别表示不要着急、暂停下来、再见和再呆会儿，根据题意选C，天晚了，恐怕我现在得走了。——好吧！再见。
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