_______ there are many different types of food, some animals spend their lives eating only one type....
2022-11-15 06:23:15 22次 2014-2015学年江苏响水中学高二上期中英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
_______ there are many different types of food, some animals spend their lives eating only one type.
A. Since B. Unless
C. Once D. While
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