问题
选择题
| In time of serious accidents _____ we know some basic things about first aid, we can save lives. |
| A. whether B. until C. if D. unless |
答案
答案：C
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| In time of serious accidents _____ we know some basic things about first aid, we can save lives. |
| A. whether B. until C. if D. unless |
答案：C
