问题描述：
英语单选题一道..
Mary made coffee __ her guests were finishing their meal.
A.so that B.although C.while D.as if
答案选择C
需要一点详细的解答思路..谢啦～～～～
Mary made coffee __ her guests were finishing their meal.
A.so that B.although C.while D.as if
答案选择C
需要一点详细的解答思路..谢啦～～～～
问题解答：
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