题目内容：
Swimming is, of course, interesting. But ______ we plan to go swimming, being safe must come first.
A.though
B.when
C.unless
参考答案：
答案解析：
选择题：Swimming is, of course, interesting. But ______ we plan to go swimming, being sa
- 题目分类：中考
- 题目类型：选择题
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