It is so cold that you can’t go outside _____ fully covered in thick clothes. ( 章节：1 难度：2)
- A、if
- B、unless
- C、once
- D、when
正确答案:B
答案解析:有
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It is so cold that you can’t go outside _____ fully covered in thick clothes. ( 章节：1 难度：2)
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